complete Case Problem Air Force Training Program.

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 com- puter terminal for further instruction. The computer guides the student, working indepen- dently, 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 pro- posed computer-assisted method. The time in hours was recorded for each student in the study. The following data are provided in the data set Training.

Course Completion Times (hours) for Current Training Method

76 76 77 74 76 74 78 75 80 79 72 69 76 78 72 82 72 73 79 82 65 77 79 73 77 79 76 78 76 76 69 79 66 70 74 72 74 77 72 78 73 79 72 70 70 81 71 70 77 78 73 76 81 69 75 75 73 77 84 74 74

Course Completion Times (hours) for Proposed Computer-Assisted Method

74 75 77 78 74 80 74 77 69 76 75 72 73 77 69 77 75 76 77 78 78 76 75 76 76 75 73 77 77 77 76 76 74 72 78 71 73 73 78 76 76 75 72 76 72 77 74 77 75 78 72 76 75 76 80 77 79 75 75 72 82

1. Use appropriate descriptive statistics to summarize the training time data for each method. What similarities or differences do you observe from the sample data?

2. Use the methods of Chapter 10 to comment on any difference between the population means for the two methods. Discuss your findings.

3. Compute the standard deviation and variance for each training method. Conduct a hypothesis test about the equality of population variances for the two training methods. Discuss your findings.

4. What conclusion can you reach about any differences between the two methods? What is your recommendation? Explain.

5. Can you suggest other data or testing that might be desirable before making a final decision on the training program to be used in the future?

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