A physiologist has the hypothesis that hormone X is important in producing sexual behavior. To investigate this hypothesis, male rats were randomly sampled and then randomly assigned to two groups. The animals in the experimental group were injected with hormone X and then placed in individual housing with a sexually receptive female. The animals in the control group were given similar treatment except they were injected with a placebo solution. The number of matings was counted over a 20-minute period. The results are shown below:

Answer the following questions. Show your work for full credit and round to the third decimal whenever necessary.

	Control Group	Experimental Group
	M1= 42	M2 =70
	SS1 =1250	SS2 =1750
	n = 6	n=6

1. State your hypotheses
2. Does the data indicate a significant difference between the treatments for a two-tailed test at the .05 level of significance? Please specify (1) the t statistic, (2) specify the boundaries of the critical region, (3) state your decision. Show your computations for full credit
3. Compute r²
4. Write up your results in a sentence as you would for a research paper