Question: A physiologist has conducted an experiment to evaluate the effect of a synthetic hormone on sexual behavior. Ten male rats were injected with the synthetic hormone, and 10 other male rats received a placebo injection. The animals were then placed in individual housing with a sexually receptive female. The dependent variable was the number of matings over a 20-minute period. The data are shown below:

a. Is their evidence that the hormone produced different sexual behavior than the placebo? Perform the appropriate hypothesis test using an \(\alpha \) of .05. (4 points).