17.35 Did the randomization produce similar groups?

First, compare the two groups in the first year. The only differeiace should be the chance effect of the random assignment.

The study report says: "In the experimental year, the degree of synchronization did not differ between food-supplemented and control females." For this comparison, the report gives t = —1.05. What type of t statistic (paired or two-sample) is this? What are the degrees of freedom for this statistic? Show that this t leads to the quoted conclusioia.