T F 2. If we are testing for the difference between two population means it is a

T F 2. If we are testing for the difference between two population means it is assumed that the sample observations from one population are independent of the sample observations from the other population. T F 3. We use the pooled estimate of the proportion in testing the difference between two population proportions. T F 4. A committee studying employer-employee relations proposed that each employee would rate his or her immediate supervisor and in turn the supervisor would rate each employee. To find reactions regarding the proposal 120 office personnel and 160 plant personnel were selected at random. Seventy-eight of the office personnel and 90 of the plant personnel were in favor of the proposal. Computed z = 1.48. At the 0.05 level it was concluded that there is sufficient evidence to support the belief that the proportion of office personnel in favor of the proposal is greater than that of the plant personnel. T F 5. In one class a statistics professor wants to compare grades on the first and second exams. This is an example of paired or dependent observations.