An Air Force introductory course in electronics uses a personalized system of instruction whereby each student views a videotaped lecture and then is given a programmed instruction text. The students work independently with the text until they have finished the training and passed a test. Of concern is the varying pace at which the students have finished this portion of their training program. Some students are able to cover the programmed instruction text relatively quickly, whereas other students work much longer with the text and require additional time to finish the course. The fast students wait until the slow students complete the introductory course before the entire group proceeds together with other aspects of their training.

A proposed alternative system involves use of computer-assisted instruction. In this method, all students view the same videotaped lecture and then each is assigned to a computer terminal for further instruction. The computer guides the student, working independently, through the self-training portion of the course.

To compare the proposed and current methods of instruction, an entering class of 122 students was assigned randomly to one of the two methods. One group of 61 students used the current programmed-text method and the other group of 61 students used the proposed computer-assisted method. The time in hours was recorded for each student in the study. The following data are provided in the file named Training.

what is the Ho that you are rejecting? Can you show us the hypothesis testing steps that lead you to this conclusion?

• Conduct a hypothesis test on the difference between the population means for the two methods. Discuss your findings.

F-Test Two-Sample for Variances Current Proposed Mean 75.06557 75.42623 Variance 15.5623 6.281967 Observations 61 61 60 60 F 2.477296 P(F