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Chapter 21: Problem 19

A psychologist uses chimpanzees to test the notion that more crowded living conditions cause aggressive behavior. The same chimps live in a succession of cages containing either one, several, or many other chimps. After several days in each cage, chimps are assigned scores on the basis of their aggressive behavior toward a chimplike stuffed doll in an observation cage.

Short Answer

Expert verified
This research scenario involves a repeated measures design experiment. The hypothesis postulates that the number of chimps in a cage (the independent variable) will influence aggressive behavior scores (the dependent variable). Further data analysis and interpretation will confirm or invalidate this hypothesis.

Step by step solution

01

Understanding the Setup

Identify the variables. The independent variable that is manipulated is the number of chimps in a cage (one, several, or many). The dependent variable that is measured to see if it changes due to the manipulation is the aggressive behavior score.
02

Hypothesis Formulation

Formulate a null hypothesis (H0) and an alternative hypothesis (HA). H0 might state that there is no significant effect of the living conditions on the aggressive behavior scores. On the other hand, HA would state that more crowded living conditions do cause an increase in aggressive behavior scores.
03

Experimental Design

Understand that the experiment would involve collecting data about the chimps' aggressive behavior scores after they've spent several days in cages with different numbers of chimps. This would be a repeated measures design where the same chimps are observed in different conditions.
04

Interpretation Considerations

Prepare to interpret the results. If significant differences in aggressive scores are observed, this could support the alternative hypothesis. However, it's important to note that correlation does not imply causation and other factors not controlled in the experiment could also impact the results.

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