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Posted on Jul 01, 2024

The widths of 100 elevator rails have been measured. The sample mean and standard deviation of the elevator rails are 2.05 inches and 0.01 inch.

a. Calculate a 95% confidence interval for the average width of an elevator rail.

b. Assume that the population standard deviation is also 0.01 inch. How large a sample of elevator rails would you have to measure to ensure that you could estimate, with 95% confidence, the average diameter of an elevator rail within 0.001 inch?

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