2. A researcher knows that a population standard deviation is a = 3. She collects a sample of n = 50 who provide a sample mean of A? = 14.20. She begins with the following hypotheses: anp = 15 H1: {1 i 15 In What type of test will she use to test this hypothesis? In For two-tailed test, a = .05: significant or not significant - For one-tailed test, a = .05: significant or not significant In For two-tailed test, a = .10: significant or not significant - For one-tailed test, a = .01: significant or not significant