Question: A test-preparation company advertises that its training program raises SAT scores by an average of at least 30 points. A random sample of test-takers who

A test-preparation company advertises that its training program raises SAT scores by an average of at least 30 points. A random sample of test-takers who had completed the training showed a mean increase smaller than 30 points.
(a) Write the hypotheses for a left-tailed test of the mean.
(b) Explain the consequences of a Type I error in this context.

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