1. Use the critical value approach to test the following, at the 5% significance level. x = 30 S = 8 n = 15 Ho: u = 20 Ha: H # 20 2. Use the critical value approach to test the following, at the 5% significance level. x = 10 0 =8 n = 15 Ho: H = 20 Ha: Ul 20 Test statistic t = 2.1 4. Use the p-value approach to test the following hypotheses at the 5% significance level. x = 30 0 = 8 n = 20 Ho: u = 25 Ha: H > 25 5. Use the p-value approach to test the following hypotheses at the 5% significance level. b) (Summary Statistics given, perform the test) x = 5.13 S = 2.25 n = 12 Ho: u = 5.2 Ha: u