A randomized study on n=50 rats tested whether living in a crowded situation had

ID: 3050616 • Letter: A

Question

A randomized study on n=50 rats tested whether living in a crowded situation had an effect on stress levels.

1. What is the researcher’s hypothesis?

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2. What is the null hypothesis?

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3. What is the independent variable? ______________________________

4. What is the dependent variable? _______________________________

5. What research design appears apparent here? _______________________________

6. What is the appropriate hypothesis test?________________________________

1) the researcher’s hypothesis : There is effect of crowded situation on stress level of rats.

2) Null Hypothesis : There is no effect of crowded situation on stress levels of rats.

3) Independent variable : In this case independent variable can be type of situation ( crowded / non crowded)

4) dependent variable: stress level is dependent variable

5) The research design is observational.

6) Since sample size is greater than 30 we will use Z test .

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