5. If you want to be 85% confident of estimating the population mean sampling error of +5 and the standard deviation is assumed to be 15, what sa required?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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b)
and n= 20 for 90% CI for the variance
5. If you want to be 85% confident of estimating the population mean to within a
sampling error of +5 and the standard deviation is assumed to be 15, what sample size is
required?
Transcribed Image Text:b) and n= 20 for 90% CI for the variance 5. If you want to be 85% confident of estimating the population mean to within a sampling error of +5 and the standard deviation is assumed to be 15, what sample size is required?
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