It's well established, we'll assume, that lab rats require an average of 32 trials in a complex water maze before reaching a learning criterion of three consecutive errorless trials. To determine whether a mildly adverse stimulus has any effect on performance, a sample of seven lab rats were given a mild electrical shock just before each trial.

(a) Given that X = 34.89 and s = 3.02, test the null hypothesis with t, using the .05 level of significance.

(b) Construct a 95 percent confidence interval for the true number of trials required to learn the water maze.

(c) interpret this confidence interval