Question: A sample of 87 glass sheets has a mean thickness of 4.20 mm with a standard deviation of 0.10 mm. a. Find a 98% confidence

A sample of 87 glass sheets has a mean thickness of 4.20 mm with a standard deviation of 0.10 mm.

a. Find a 98% confidence interval for the population mean thickness.

b. What is the level of the confidence interval (4.185, 4.215)?

c. How many glass sheets must be sampled so that a 98% confidence interval will specify the mean to within ± 0.015?

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a X 420 s 010 n 87 z 01 233 The confidence interval is 420 23301087 o... View full answer

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