A sample of 87 glass sheets has a mean thickness of 4.20 mm with a standard deviation of
Chapter 5, Problem 4(choose chapter or problem)
A sample of 87 glass sheets has a mean thickness of \(4.20 \mathrm{~mm}\) with a standard deviation of \(0.10 \mathrm{~mm}\).
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 \(±0.015?\pm 0.015\)?
Equation Transcription:
Text Transcription:
4.20 mm
0.10 mm
\pm 0.015
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