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Dr. Johnson expects a new medicine to increase sleeping time for patients with insomnia. He should use a tail to test his hypothesis. test with

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Dr. Johnson expects a new medicine to increase sleeping time for patients with insomnia. He should use a tail to test his hypothesis. test with the region of rejection in the O a, One-tailed; left O b. One-tailed; right O c. Two-tailed; alpha O d. Two-tailed; distribution

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