The Cooper Company discussed in Problem 13-40 has a second contract with a private firm for which
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The contract allows for at most 5% defectives. The head of quality control recently compiled a list of the sampling results for the past 300 days in which five randomly selected fuses were tested, with the following frequency distribution for the number of defectives observed. She is concerned that the binomial distribution with a sample size of 5 and a probability of defectives of 0.05 may not be appropriate.
Number of Defectives Frequency
0……………………………………………..209
1………………………………………………33
2………………………………………………43
3………………………………………………10
4………………………………………………..5
5………………………………………………..0
a. Calculate the expected values for the cells in this analysis. Suggest a way in which cells can be combined to assure that the expected value of each cell is at least 5.
b. Using a significance level of 0.10, what should the quality control manager conclude based on these sample data? Discuss.
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Related Book For
Business Statistics A Decision Making Approach
ISBN: 9780133021844
9th Edition
Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry
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