9.1 - Using the information below, conduct a hypothesis test using the 4-step approach: H0: 1 - 2 = 0 Ha: 1 - 2 < 0 = .01 Sample 1 Sample 2 n1 = 8 n2 = 11 x1 = 24.56 x2 = 26.42 s 2 1 = 12.4 s 2 2 = 15.8 Step 1 - State the hypothesis (already done for you...see above). Will this be a one-tailed or a two-tailed test? Step 2 - Set the criteria for a decision. What is your df? Step 3 - Compute the test statistic. Step 4 - Make a decision. 9.2 - Using the information below, conduct a hypothesis test using the 4-step approach: H0: D = 0 Ha: D < 0 = .01 Employee Pretest Posttest d = -7.11 1 38 22 2 27 28 sd = 6.45 3 30 21 4 41 38 5 36 38 6 38 26 7 33 19 8 35 31 9 44 35 Step 1 - State the hypothesis (already done for you...see above). Will this be a one-tailed or a two-tailed test? Step 2 - Set the criteria for a decision. What is your df? Step 3 - Compute the test statistic. Step 4 - Make a decision. 9.3 - Using the information below, conduct a hypothesis test using the 4-step approach: H0: 1 - 2 = 0 Ha: 1 - 2 0 = .10 Sample A Sample B n1 = 21 n2 = 21 x1 = 118 x2 = 113 s 2 1 = 23.9 s 2 2 = 21.6 Step 1 - State the hypothesis (already done for you...see above). Will this be a one-tailed or a two-tailed test? Step 2 - Set the criteria for a decision. What is your df? Step 3 - Compute the test statistic. Step 4 - Make a decision. 9.4 - Using the information below, conduct a hypothesis test using the 4-step approach: H0: D = 0 Ha: D 0 = .05 Customer Before After d = -2.54 1 107 102 2 99 98 sd = 3.48 3 110 100 4 113 108 5 96 89 6 98 101 7 100 99 8 102 102 9 107 105 10 109 110 11 104 102 12 99 96 13 101 100 Step 1 - State the hypothesis (already done for you...see above). Will this be a one-tailed or a two-tailed test? Step 2 - Set the criteria for a decision. What is your df? Step 3 - Compute the test statistic. Step 4 - Make a decision.