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Why is important to perform several trials of an experiment?
becase it reduces the percent error and it gives a much better idea of what is the best result
Why is it important to have many subjects in a experiment?
Having many subjects in an experiment is crucial for increasing the reliability and validity of the results. A larger sample size helps to minimize the impact of random variation and reduces the likelihood of outliers skewing the data. This enhances the generalizability of the findings, allowing researchers to draw more accurate conclusions about the population being studied. Additionally, it improves the statistical power of the experiment, making it easier to detect significant effects if they exist.
What is the contolled and experimental group in an experiment?
Experimental control is a group of experimental subjects that is not exposed to a chemical or treatment being investigated so that it can be compared with experimental groups that are exposed to the chemical or treatment It is also the standard of comparison. -Also, look for the following things: Experimenter Bias, History, Maturation, Instrumentation, Selection, Order, and Statistical regression. All of these should be questioned.
The advantage of using an inclined plane to lift an object is that it reduces the?
Force required to move the object forward.
What is disclosed observation?
A disclosed observation is when the participants are aware that they are being observed. This reduces ethical issues of consent and privacy but reduces validity due to increased demand characteristics.
In an experiment to see if having a nurse come three times to visit the homes of newborn babies reduces doctor visits what is the independent variable?
The independent variable is the frequency of nurse visits (three visits) to the homes of newborn babies.
Reduces an equation that has two variables to an equation that has one variable It is then possible to find the solution for this variable?
Substitution
What reduces an equation that has two variables to an equation that has one variable It is then possible to find the solution for this variable?
substitution
What reduces an equation that has two variables to an equation that has one variable It is the possible to find the solution for this variable?
substitution
What Reduces an equation that has two variables to an equation that has one variable?
Substitution........apex
Randomization in an experiment reduces bias between the treatment and control groups?
True
What is the type of homeostatic mechanism that reduces any changes in the value of a variable or keeps a variable close to a particular pre-established setpoint?
Negative feedback is the homeostatic mechanism that reduces any changes in the value of a variable or keeps a variable close to a pre-established setpoint. When the system detects a deviation from the setpoint, it initiates actions to bring the variable back to its desired level.
Does increasing the variable cost increase the contribution margin?
Increase in variable cost reduces the contribution margin as following formula suggests”Contribution margin = Sales revenue – Variable Cost
What is a positive negative correlation?
Correlation determines relationship between two variables. For example changes in one variable influence another variable, we can say that there is a correlation between the two variables. For example, we can say that there exists a correlation between the number of hours spent on reading and preparation and the scores obtained in the examination. One can infer that higher the amount of time spent on preparation may result in better performance in examination leading to higher scores. Hence the above is a case of positive correlation. If an increase in independent variable leads to an increase in dependent variable, it is a case of positive correlation. On the other hand if an increase in independent variable leads to a reduction in dependent variable, it is a case of negative correlation. An example for negative correlation could be the relationship between the age advancement and resistance to diseases. As age advances, resistance to disease reduces.
What reduces a equation that has two variables to an equation that has one variable?
combining like terms or subtracting from both sides of the equation.
How does sample size affect validity of results in a research?
A large sample reduces the variability of the estimate. The extent to which variability is reduced depends on the quality of the sample, what variable is being estimated and the underlying distribution for that variable.
How do variable costs impact the overall profitability of a business?
Variable costs directly impact the overall profitability of a business by increasing or decreasing based on the level of production or sales. When variable costs rise, it reduces the profit margin, while lower variable costs can lead to higher profits. Managing variable costs effectively is crucial for maximizing profitability in a business.
