6) The following is information the number of units that reduced for blood pressure for two different groups. Each parts 5 points total 10 points Group n s Control 10 5 4 Intervention 10 10 3 a) What is a 95 percent confidence interval for control? 1. 2.14 and 7.86 2. 4.50 and 5.67 3. 3.5 and 6.39 4. 1.87 and 3.53 b) We would like to know if these data provide us sufficient evidence that the variance of number units reducing blood pressure for control population is greater than intervention population. What statistical test you would use? 1. Two sample T-test when population variance is known 2. One sample T-test when population variance is unknown 3. One sample T-test when population variance is known 4. Two samples T-test when population Variance is unknown