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[Step-by-Step] If you wish to estimate a population mean within 0.2 using a 95% confidence interval and you know from prior sampling that σ ^2 is

Question: If you wish to estimate a population mean within 0.2 using a 95% confidence interval and you know from prior sampling that \({{\sigma }^{2}}\) is approximately equal to 5.4, how many observations would you have to include in your sample.

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