Essay
(A) Construct a 95% confidence interval for the average width of an elevator rail. Do we need to assume that the width of elevator rails follows a normal distribution?
(B) How large a sample of elevator rails would we have to measure to ensure that we could estimate, with 95% confidence, the average diameter of an elevator rail within 0.01 inch?
Correct Answer:
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(A) n = 100, 
The assumption ...View Answer
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Correct Answer:
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The assumption ...View Answer
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