In a test of the reliability of products produced by two machines, machine A produced 11 defective parts in a run of 140, while machine B produced 10 defective parts in a run of 200. Do these results imply a difference in the reliability of these two machines?
A company offers a seminar on a technical subject to its employees. Before the seminar begins, each employee scores their self-rating of knowledge on the subject. Three months after the seminar, each employee again rates their knowledge of the subject. The data are shown in Table 5.18.
(a) Is there evidence that employees believe their knowledge has improved?
(b) There were actually 12 employees in the seminar, but 6 did not return the follow-up rating. What type of bias might this nonresponse introduce into the analysis?
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