13.6 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.

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