Given that the population standard deviation is σ = 1, determine the minimum sample size needed in order to estimate the population mean so that the margin of error is E= .2 at 95% level of confidence.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
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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Given that the population standard deviation is σ = 1, determine the minimum sample size needed in order to estimate the population mean so that the margin of error is E= .2 at 95% level of confidence. 

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