In a production facility, 10% of the parts produced are defective. With a .95 probability, the sample size that needs to be taken if the desired margin of error is 4% is
A. 100
B. 217
C. 95
D. 111
Analysis:
A. Incorrect. It requires a sample size of at least 217
B. Correct. It requires a sample size of at least 217
C. Incorrect. It requires a sample size of at least 217
D. Incorrect. It requires a sample size of at least 217
ANSWER : B
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