You are conducting a study to see if students do better when they study all at once or in intervals. One group of 15 participants took a test after studying for one hour continuously. The other group of 15 participants took a test after studying for three twenty minute sessions. The first group had a mean score of 75 and a variance of 120. The second group had a mean score of 86 and a variance of 100.

a)What is the calculated t value? Are the mean test scores of these two groups significantly different at the .05 level?

What would the t value be if there were only 7 participants in each group? Would the scores be significant at the .05 level?