2. A researcher knows that a population standard deviation is = 3. She collects a sample of = 50 who provide a sample mean of = 14.20. She begins with the following hypotheses: 3: = 15 5: 15 What type of test will she use to test this hypothesis? ______________________________ For two-tailed test, = .05: significant or not significant For one-tailed test, = .05: significant or not significant For two-tailed test, = .10: significant or not significant For one-tailed test, = .01: significant or not significant