You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=38.8σ=38.8. You would like to be 90% confident that your estimate is within 10 of the true population mean. How large of a sample size is required? Round up to nearest whole number.n =

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Asked Nov 23, 2019
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You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=38.8σ=38.8. You would like to be 90% confident that your estimate is within 10 of the true population mean. How large of a sample size is required? Round up to nearest whole number.

n = 

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Expert Answer

Sample size is calculated as follows:
n =
E
(1.645) (38.8)
102
(2.7)(1,505.44)
100
4,064.688
100
41
Thus, the required sample size is 41.
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Sample size is calculated as follows: n = E (1.645) (38.8) 102 (2.7)(1,505.44) 100 4,064.688 100 41 Thus, the required sample size is 41.

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