Monthly Archives: June 2022

man sitting in front of three computers

Decision-Making and the Brain

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Decision-making generally takes place in one of two ways. The two ways are the reflective system and the reactive system. The reflective system is the analytical way of making decisions and is often characterized as methodical and logical. Although the thought process is carefully laid out when using the reflective system, the downside is that reflecting is much slower than reacting. Therefore although often viewed as superior, the reflective system is not always the optimal choice.

Two Systems

The reactive system is intuitive and relies more on emotions when compared to the reflective system. Although much faster than the reflective system, the reactive system is much less accurate and or careful. As such, the benefit of reactive is when spending is needed, and the complexity of the problem is not significant. Children tend to rely more on the reactive system as they lack the cognitive ability and experience to ponder reflectively.

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The system that people use often depends on their emotional states. When people are calm, and at peace, they are more likely to use the reflective system. However, if people are angry, sad, happy, etc., they may use the reactive system. We have all been in situations where our emotions control us when dealing with students. This may be an example of the reactive system taking over reasonably. The choice of which system is also associated with personality as some prefer one style over another regardless of their emotional state.

Different decisions can rely on different systems. If a teacher faces a routine decision, they may choose to use the reactive system to make a fast decision. If the situation is novel and unusual, the teacher may adopt a reflective approach. This is one reason why experienced teachers can work faster. The speed is based on using prior knowledge to make a quick, insightful decision that reactively while a new teacher has to reflect on every single experience because they are all so novel.

Types of Decisions

Decisions that are repeated frequently and based on rules are called programmed decisions. These can include things such as when to take a break, how much time to give for a test, etc. The ability to autopilot these decisions comes from experience.

Non-programmed decisions are decisions in a context in which clear criteria are not available. Examples of non-programmed decisions in the classroom may include equipment breakdowns, accepting new students, etc. This implies that reflection will be necessary to decide in this unclear situation.

Conclusion

The point here was not to try and make a case that one form of decision-making is superior to the other. Each system has its pros and cons and what really determines what’s best is the context in which the decision needs to be made. There is little time for reflecting if there is a fire in the class. In addition, it is equally harmful to determine students’ grades reactively.

Responsibilities and Skills of Teachers

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Every job has its list of responsibilities and skills required for the position. This post will look at some of the common skills and responsibilities associated with teaching.

Planning/Coordinating

Teachers are expected to spend a large amount of their time making daily and long-term lesson plans. Developing these plans can include setting long-term goals, short-term objectives, procedures, assignments, and more. However, Once plans are developed, they have to be implemented, which involves coordinating students’ behavior and, at times, working with people outside of the class for various reasons.

Controlling/Supervising

Teachers have to constantly observe the behavior of their students and make adjustments to what plans or goals they have in mind. For example, if students are struggling, the teacher needs to slow down and reteach. Suppose the problem is not comprehension but a rather poor attitude. In that case, the teacher needs to modify how they enforce rules.

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Teachers also have to track resources such as paper, pencils, books, time, etc. These things must be observed while also trying to move forward in the curriculum and maintain learning.

Professional Development

Teachers also must stay abreast of the latest developments in their field. This includes changes and innovation in teaching and in one’s area of expertise. Different fields change at different speeds, but all teachers have to stay current to help students to be prepared for the workforce and or college.

Staying current in one’s profession is not overly time-consuming. The real challenge is doing this along with the other responsibilities of teaching and the demands of one’s life outside the classroom.

Skills of Teachers

The skills of teachers can be broken down into three categories

  • Technical skills
  • Human relation skills
  • Conceptual skills

Technical skills are essentially the expertise of the teacher. For example, a math teacher knows math and can use it practically. In addition, teachers must have technical knowledge of teaching, such as familiarity with pedagogy and various approaches to instruction. Generally, a teacher must have a high degree of technical skill because they are a teacher to others.

Human relation skills are the ability to work with other people. Teachers need to have ways to connect with students to inspire enthusiasm and growth. In addition, teachers also need to maintain relationships with other teachers, parents, and the administration. Working with others is often dicey, and surprisingly, teachers can often struggle to maintain a cordial relationship with their peers, students, and community members.

Conceptual skills relate to planning and seeing the big picture. Developing this skill comes with experience. For example, new teachers often cannot see beyond developing daily lesson plans, while more experienced teachers can plan months or semesters at a time. Conceptual skills become more important if a teacher moves more in the direction of leadership after a few years in the classroom.

Conclusion

Teaching is a challenging field in that it calls on a person to keep track of several important tasks while also developing themselves and working with others. Since doing this is no easy task, perhaps that is why so many teachers can find their jobs challenging.

KMeans Clustering with Python VIDEO

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Kmeans clustering is an unsupervised learning technique used to place date in various groups as determine by the algorithm. In this video, we will go step by step through the process of using this insight tool.

Teachers as Classroom Managers

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Henry Mintzberg (1973) researched what business managers do within companies. His results indicated that managers have three primary roles, which are…

  • Interpersonal
  • Informational
  • Decisional

We will examine each of these roles within the context of a teacher as a classroom manager.

Interpersonal Roles

The interpersonal role of a manager involves dealing with many people during a given day. Managers serve as figureheads, and this involves such tasks as greeting guests, participating in various ceremonies/formal activities, and being the general face of whatever they are in charge of. Teachers are frequently involved in figurehead-type roles as classroom managers. For example, teachers are often responsible for flag ceremonies in the morning, participating in graduation, responding to guess who comes to the classroom, etc. As such, teachers have a lot in common with business managers in the role of figurehead.

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A second interpersonal role for managers is that of liaison. The liaison role involves maintaining connections outside of the group or unit that the manager is in charge of. It also involves connecting people within the organization with those outside and keeping track of information gained through external and internal relationships. For teachers, serving as a liaison is not as common in my experience. Often the student has access to the same people like the teacher. One exception may be if a teacher helps a student obtain a job or get into a college by providing connections to such opportunities.

A final interpersonal role of managers as a leader. The leader role involves training, motivating, and communicating with subordinates. When most people think of managers, this may be the first thing that comes to mind. This is also a primary function for teachers as they are expected to lead the classroom and communicate expectations with students.

Informational Roles

The informational role defines itself and involves obtaining pertaining data relating to the goals of the manager’s team. One role that falls under this category is that of a monitor. The manager is supposed to gather information from various sources to improve decision-making, among other things. Teachers also have to play this role as one of their primary functions is communicating what they have learned with their students. Teachers and managers who like knowledge or expertise will generally struggle with their role as a manager.

A second informational role is that of a disseminator of information. As mentioned with the teacher, the manager gathers information to share it. There are various lines of communication such as telephone, email, chat, etc. Whatever channel(s) is chosen is just how the manager shares information. We have already discussed how teachers spend the majority of their time sharing information, so we do not need to add much but to mention that it is important to consider how the information is shared in that do the students understand.

Lastly, managers serve as spokespersons, which means sharing information with people outside the unit or team. Sharing information like this can involve speaking with superiors, members of the community, etc. For teachers, the role of spokesperson may involve sharing concerns of their students with administration or with other teachers. Students sometimes like to raise concerns about things that the teacher can speak about because the teacher has a higher status. Thus the spokesperson role may be an advocacy position for a classroom teacher.

Decisional ROles

The final collection of roles of managers involves decisions. A manager is also an entrepreneur, which involves taking the initiative in projects and delegating responsibilities. Teachers are often implementing new ideas and teaching approaches in their classroom, and when possible, they will delegate responsibilities to students.

Managers also must handle conflicts and other emergencies. These conflicts can be among coworkers, with people outside the team, and even with the manager themself. As such, diplomatic skills are an important aspect of a manager’s skill set. Teachers may deal with even more conflicts than managers, given the age of the students. Both managers and teachers have in common the must know how to handle conflict and surprises.

Managers are also resource allocators, and this involves sharing not necessarily information but tangibles things such as budget resources, determining schedules, and setting wages. Teachers also serve as resource allocators as they determine who gets to use the computers, when it’s time to play, what rewards students get for good behavior, and much more. Care must be given to resource allocation as hints of unfairness and favoritism can lead to conflict.

The final role of a manager is that of a negotiator. This role is often paired with many of the other roles already mentioned. For example, the manager may negotiate as a spokesperson for their team, negotiate a conflict between subordinates, etc. For teachers, the same ideas apply. Teachers have to negotiate for themselves, their students, and with parents as just some examples.

Conclusion

From the examples presented here, we can see that teachers as classroom managers have a lot in common with managers in the business world. Both teachers and manger need to perform roles that involve interpersonal skills, informational skills, and decision-making skills. As such, a knowledge of management in the context of business could help teachers in their classrooms.

Acid & Bases

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We will take a look at some simple ideas related to acid bases

Acids and bases are classified by the chemical behavior of their molecules. Acids usually have a sour taste, are covalent electrolytes, and turn litmus paper red. Citric acid is one example of an acid many of us have encountered as it is commonly found in citrus fruits such as oranges. At a technical level, acids donate a H+ ion during a chemical reaction.

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On the other hand, Bases tend to have a better taste, are slippery when mixed with water, and turn litmus paper blue. Soap is one example of the use of a base in everyday life. Bases accept an H+ ion during a chemical reaction at a technical level. When acids and bases are mixed, they generally neutralize each other and produce water as a by-product.

Most acids and bases are aqueous solutions, which means they are found in a liquid state. However, some liquids do not neatly fall into the category of acid or base. Water is an example of this, and the term used to describe this is amphoteric. This means that water will sometimes donate an H+ ion or accept an H+ ion depending on the context. For this reason, water is often added to acids/bases to dilute the concentration of either one.

Water is also considered neutral on the pH scale commonly used to identify acids and bases. The Ph scale stands for potential hydrogen scale and measures the amount of hydronium ion in the solution. Lower numbers on the pH scale indicate higher levels of hydronium.

Most fruits and vegetables are considered to have low pH, thus considered base or alkaline, and they include the following

  • Avocados
  • Persimmon
  • lentils
  • Olives, black
  • Honeydew melon
  • Mangoes, ripe
  • Honeydew

Foods that are acidic in nature include the following

  • Most dairy
  • Citrus fruits
  • Meat
  • Sweeteners
  • Alcohol

There are lots of websites that promote such things as an alkaline diet. However, this is generally highly controversial, and the experts do not seem to agree about the benefits of eating alkaline foods.

Conclusions

Understanding acids/bases and their behavior can be important, especially in everyday life. Acid and bases serve a vital role in many different substances and can be helpful or harmful depending on the context.

Gases, Pressure, & Laws

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It is common in chemistry to have to deal with gases. Naturally, scientists have uncovered various laws that describe how gases act. This post will look at concepts such as pressure and the development of various laws related to gases and pressure.

Pressure and Units

Pressure is defined as (force / area). To make this practical, scientists have found that our bodies are constantly exposed to 14.7 pounds of pressure per square inch by the air around us. Our bodies are so used to this constant external pressure that without it breathing would be difficult, if not impossible.

There are various units of measurement of pressure. The Pascal, named after Blaise Pascal, is newtons per meter square. However, Pascals are rarely used by scientists. Another common unit is standard atmospheric pressure or atm for short, which is the average amount of pressure exerted by air at sea level. As a fact, one atm is the equivalent of 101,325 pascals.

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One more unit for pressure is the torr, which is 1 /760th of an atm. In terms of measuring pressure, it is common to use a barometer, and a barometer measures pressure using millimeters of mercury or mmHg. The units on a barometer are almost the same as for the torr.

Laws Related to Gases

There are several laws related to gases. For example, Boyle’s law states an inverse relationship between pressure and volume with the assumption that temperature is constant. In other words, when the pressure goes up, the volume will go down and vice versa. Boyle’s law was developed by Robert Boyle, an Irish scientist from the 17th century.

Breathing is based on Boyle’s law. When we breathe, inhaling causes the volume of our lungs to grow, which leads to a drop in pressure. The pressure drop is what allows air to flow into the lungs. The opposite takes place when we exhale. Our lungs become smaller, raising the pressure and forcing the air out of our bodies.

Charles’s laws are somewhat of a variation on Boyle’s law. This law was developed by Jacques Charles, a French scientist of the 18th century. Charles law states that if pressure is constant, then temperature and volume are proportional. In other words, when the temperature goes up or down, then the volume will go up or down.

An interesting by-product of Charles’ law is the idea behind absolute zero. Essentially, as we lower the temperature, the volume of a gas will shrink. However, gas is made of matter, and it can’t go to zero. This implies that there is a lower limit to temperature, and this lower limit is called absolute zero and is -273.15 C.

As shown below, the combined gas law combines Boyle and Charles’ law into one equation.

(p * v) / T

Pressure times volume captures a value to describe a gas in a particular context. However, we use the equation to solve for unknown values, so it is more appropriate to show it as follows.

(p1 * v1) / T1 = (p2 * v2) / T2

Conclusion

People generally dislike pressure, but the pressure is literally needed for life, at least when it comes to gases. Thanks to the work of many excellent scientists, we have a better understanding of how gases behave in the world around us.

Crowds and Theories on Collective Behavior

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This post will look at various types of crowds that we often find ourselves a part of at different times. In addition, we will look at two theories that attempt to explain the collective behavior that happens when crowds form.

Crowds

A crowd is a group of people who are close to each other. There are several types of crowds. A casual crowd is a group of people who are together but not really interacting with each such as what one would find in a shopping mall. In the shopping mall, there are lots of people, but the interaction among the people is often limited to small groups.

A conventional crowd is a group of people who come together for a scheduled event. A common example of a conventional crowd would be people coming together for a religious service. In such an environment, the people have a general-purpose. There is generally more interaction because of the unity that a religious experience can often bring people.

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An expressive crowd is a crowd that is together for an emotional purpose. Examples of expressive crowds can include such things as weddings and funerals. Lastly, an acting crowd is a crowd that comes together for a specific purpose or goal, such as a sporting event. Of course, these categories are artificial, and maybe an event may not fit neatly in anyone exclusively, but they do provide a way to organize large groups of people.

When people find themselves in crowds, they often exhibit the group’s norms, which is called collective behavior. For example, a perfectly rational individual will begin to act emotionally in a charismatic religious experience or will become violent within the context of a riot.

Emergent Theory

Several theories have attempted to explain how norms in crowds develop. Emergent norm theory states that people react to the crowd they are in with their own norms, which change as the crowd responds to different stimuli. For example, suppose people are angry and frustrated with the government. In that case, the group may believe that breaking and burning things is acceptable. Outsiders consider this lawbreaking, but for the people within the crowd, this is justifiable behavior in the face of injustice. In other words, the emergent theory attempts to explain that the behavior of a crowd is not irrational and unpredictable but rather a logical response to the current situation.

An example of such behavior can be found in the protesting in the US. People got together and began to break into buildings and steal and destroy property. Things individuals would have never done by themselves were brazenly done in a justified manner due to the perception of injustice.

Value-Added Theory

Value-added theory states that several conditions must be present for collective behavior as found in a crowd can take place.

  1. The first is structural conduciveness which means that people are aware of a problem and begin to gather together.
  2. The second is a structural strain which is people developing frustration over the unsolved problem.
  3. Third is growth and spread of disbelief which means the problem is clearly defined and blame is placed on an individual or group.
  4. The fourth condition is called precipitating factors, which is a trigger event that leads to collective behavior.
  5. The fifth condition is mobilization which involves the emergence of leaders to guide the crowd.
  6. The final condition is social control, and this involves the process of ending the collective behavior.

The protesting that has taken place in the US can also be explained from the perspective of value-added theory. A group of people gather together over a perceived injustice, they begin to get angry, they blame the people in positions of power, some starts to break, burn or steal something, more people follow this example and chaos breaks out, only after a time are the authorities able to end the carnage.

These conditions do not have to happen linearly, but most must be present for collective behavior to begin. For example, leaders can emerge at the beginning rather than the fifth condition.

Conclusion

The theories above try to explain from different viewpoints a phenomenon that most of us have experienced: the loss of self when moving in a crowd. The behavior of such crowds does not have to be negative, but it is negative behavior that is easier to notice compared to positive action. In whatever case, these theories do provide some insight into what can be a blessing or a curse.

Solutes, Solvents, & Molality

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A solution in chemistry is a homogenous mixture of two or more substances. The substances that are found in a solution can further be broken down into two types, and these are solute and solvent. The solute is the substance(s) dissolved into a solution. A solvent is a substance into which a solute is dissolved. In other words, solutes generally disappear into solvents. An example would be pouring salt into water. The salt is the solute, and the water is the solvent, and it appears that the salt disappears when added to water.

There is a limit to how much solute can be dissolved into a solvent. The term for this is solubility. Solubility varies from substance to substance but as an example, salt has a solubility of 35.9 grams per 100 grams of water. This means that you can dissolve 35.9 grams of salt in 100 grams of water. Any more salt, and there will be no more dissolving. The technical term when a solute can no longer dissolve in a solution is saturation, and the solution is now saturated.

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Solubility is also affected by temperature. For a gas, the solubility increase as the temperature is lowered. However, the solubility of a gas increases with an increase in pressure. For solids, solubility actually increases with temperature.

Concentration

The concentration measures the amount of substance in a given volume. Concentration is measured by a unit called molarity. Molarity is the proportion of the moles of solute to the liters of solution. For example, suppose I have 150 grams of calcium nitrate, and I dissolve this into 1 liter of water. In that case, I can calculate the molarity as follows.

  1. Determine the amu of calcium nitrate
    1. This is calculated by finding the number of amu, which in this case is 164.10 amu
  2. Convert the amu to moles
    1. This is done by placing the original grams as the numerator of a fraction and the amu as the denominator, which is
    2. 150/164.10 = 0.9141 moles
  3. Use the ratio
    1. Our answer is simple it is moles to solution as shown below
    2. 0.9141 moles / 1 liter = 0.9141 M

Freezing and Boiling

A final point to mention is a term called freezing point depression. This involves mixing solutes and solutions that can change the freezing point of the substance. What is taking place is that when a solute is added to a solution, it now requires more energy to freeze the new substance. This is why salt is thrown on roads during icy days. The salt lowers the temperature at which ice can form, thus making the roads safer. However, there is a limit, and if it becomes cold enough, the salt will no longer have the desired effect.

Another factor involves the boiling point. Solutes increase the temperature that is needed for boiling to occur.

Conclusion

Solutes and solvents are among many terms used in chemistry to define the behavior of substances in a certain context. It is amazing how complex the world is and how there is always so much more that can be learned in various knowledge domains.

Random Forest in Python VIDEO

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Random forest is a machine learning algorithm that makes multiple decision trees in order to make the best decision. By making many trees you can avoid the mistake of overfitting to the data, which is a common weakness of decision trees.

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Demographic Theories

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People have tried to explain population growth and decline for centuries. A major topic of controversy today is how to deal with an ever-increasing population. This post will look at several theories that try to address population growth.

Malthusian Theory

Thomas Malthus is famous for claiming that the Earth would lose its ability to sustain an ever-growing population. In his theory, Malthus claims three factors would limit the growth of humans on Earth. These three factors are war, famine, and disease. Malthus defined these three factors as “positive checks” because they increase mortality.

Malthus also defined “preventive checks” or factors that reduced fertility. These factors were birth control and celibacy. As resources were depleted, Malthus theorized that they would begin to fight wars, generally leading to famine and disease. As the fighting over resources continued, people would limit the children they have or even forgo marriage and having children together.

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Malthus’s predictions turned out to be incorrect. There have been technological improvements that he could never have foreseen. These improvements in technology have not only increased food production but have also included treatments for diseases that used to kill.

However, Malthus was correct about preventive checks. In the western world and some parts of Asia (Japan, China, Singapore, and Thailand). Fertility rates have plummeted as people focus on careers and other things rather than raising a family. The general trend of the world is an increase in people, but this may change with time.

Zero Population Growth

A variation on Malthus theory was developed by Paul Ehrlich. Ehrlich states that the environment and not food supply is the factor that determines the planet’s population. As more and more people abuse the environment, it endangers the human population.

Ehrlich’s solution to this problem is zero population growth which, as its name implies, that the number of births equals the number of deaths. No practical way has been found to do this, but this demographic theory is often associated with conspiracy theories of how the elite wants to limit population growth.

Cornucopian Theory

The opposite of Malthus and Ehrlich’s position would be cornucopian theory. This theory posits that human ingenuity can resolve whatever problems humans face. It is possible to cite human ingenuity examples that develop after a crisis, such as vaccinations. However, often by the time the breakthrough is implemented, the catastrophe has already done significant damage has already been done.

Not even the Black Death of the medieval period completely wiped out humanity. The cornucopian theory is always correct until something happens on Earth that wipes out human existence.

Demographic Transition Theory

Demographic transition theory takes a modeling approach to demographic change. Population growth follows four predictable stages in this theory, as explained below.

Stage 1: Births, deaths, and infant mortality are high with low life expectancy.

Stage 2: Birth rates are high while infant mortality and death drops with an increase in life expectancy

Stage 3: Birthrates decline for the first time while death rates continue their decline, life expectancy continues to increase

Stage 4: Birth and death rates keep falling, life expectancy peaks, the population stabilizes, and may start to decline.

These stages are often associated with industrialization. Many countries enter stage 2 when they begin to industrialize. A fully developed country is often found in stage 3, while a post-industrial country could be found in stage 4.

Conclusion

The question that perhaps everyone is wondering is perhaps how much more can the population grow on this planet? It may be impossible to know for sure. Every time it appears the Earth has reached its limit, new resources are discovered, and there is a boost in technology that makes it easier to continue life with whatever resources are available. A question such as this is one that experts will wrestle with for a long time.

Aggregating Data with dplyr VIDEO

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Aggregating data is a critical step in the data analysis process. In the video below, you will see an example of how to aggregate data using the dplyr package from R.

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