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