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Can you help me solve this? If you wish to estimate a population mean with a margin of error ME equal to 0.32 using a95%

Can you help me solve this?

If you wish to estimate a population mean with a margin of error ME equal to 0.32

using a95% confidence interval and you know from prior sampling that sigma squared

2 is approximately equal to 6.4,how many observations would have to be included in yoursample?

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