Question

A study found that rats that received a drug took longer to find their way out of a maze than rats that received a placebo, F(1, 57) = 6.23, p < 0.05. The drug had a large effect on albino rats and virtually no effect on wild-bred rats, F(1, 57) = 10.61, p < 0.05. However, there was no overall difference in the time of albino rats compared to that of wild-bred rats, F(1, 57) = 1.29, p > 0.10. Which effect(s) must be present for these results to be true?

• main effect of drug
• main effect of rat species
• interaction of drug and rat species
• main effect of drug and an interaction of drug and rat species

Answer 1

The results of the study indicate a main effect of drug and an interaction of drug and rat species.

Step-by-step explanation:

The results of the study indicate that there must be a main effect of drug and an interaction of drug and rat species for these results to be true.

This is because the study found that the drug had a large effect on albino rats but virtually no effect on wild-bred rats, which suggests a main effect of drug. Additionally, the study found that there was no overall difference in the time of albino rats compared to wild-bred rats, indicating an interaction between drug and rat species.