The personnel manager of a large insurance company wishes to evaluate the effectiveness o

Question: Question 4

The personnel manager of a large insurance company wishes to evaluate the effectiveness of four different sales-training programs designed for new employees. A group of 32 recently hired college graduates are randomly assigned to the four programs so that there are 8 subjects in each program. At the end of the month long training period, a standard exam is administered to the 32 subjects. The scores are as follows:

A	B	C	D
66	72	61	63
74	51	60	61
82	59	57	76
75	62	60	84
73	74	81	58
97	64	55	65
87	78	70	69
78	63	71	80

(a) Determine whether there is a significant difference among the four sales-training programs at the 0.05 level of significance.

(b) If we reject the null hypothesis, further tests would usually be done to determine which of these means are significantly different. Without doing this further testing, which of the two means do we know must be different?

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