A researcher knows that a population standard deviation is o = 3. She collects a sample of n = 50 who provide a sample mean of x= 14.20. She begins with the following hypotheses: H0: u = 15 H1: u ≠ 15 What type of test will she use to test this hypothesis? ______________________________ • For two-tailed test, a = .05: significant or not significant • For one-tailed test, a = .05: significant or not significant • For two-tailed test, a = .10: significant or not significant • For one-tailed test, a = .01: significant or not significant

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