Compute the standard deviation and variance for training

Question

Discussion:

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. Attached is the Excel spreadsheet with the times.

Response to following:

Q1. Use appropriate descriptive statistics to summarize the training time data for each method. What similarities or differences do you observe from the sample data?

Q2. Comment on any difference between the population means for the two methods. Discuss your findings

Q3. 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

Q4. What conclusion can you reach about any differences between the two methods? What is your recommendation? Explain

Q5. 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?

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