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Example 2: According to a study by the Centers for Disease Control, the national mean hospital stay for a woman after childbirth is 2.1 days with a standard deviation of 1.2 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a sample of 81 women after childbirth is 2.0 days. test the claim that this hospital keeps new mothers shorter than the national average at α = 0.10.