Determine the minimum sample size required when you want to be 90​% confident that the sample mean is within one unit of the population mean and σ=13.8. Assume the population is normally distributed. A 90% confidence level requires a sample size of enter your response here. ​(Round up to the nearest whole number as​ needed.)

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Determine the minimum sample size required when you want to be
90​% confident that the sample mean is within one unit of the population mean and σ=13.8.
Assume the population is normally distributed. A 90% confidence level requires a sample size of enter your response here.
​(Round up to the nearest whole number as​ needed.)
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