A psychologist interested in animal learning conducts an experiment to determine the effect of adrenocorticotropic hormone (ACTH) on avoidance learning. Twenty 100-day-old male rats are randomly selected from the university vivarium for the experiment. Of the 20 chosen rats, 10 randomly chosen rats receive injections of ACTH 30 minutes before being placed in the avoidance situation. The other 10 rats received placebo injections. The number of trials for each animal to learn the task are listed below. Do NOT assume a normal distribution, and use α=0.05 to answer the questions below: ACTH Placebo 58 74 72 92 80 87 57 84 75 71 73 82 79 76 70 90 66 95 77 85 What inferential test is being conducted? What is the obtained statistic?  What determines the critical value?

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A: Expected value (E) =Total frequency 5

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A:

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A: Anova is used to to test more than two means.

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.