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Use a calculator to Find the Confidence interval for the true Population Mean if a sample of 54 has a mean of 27.8 and a

Use a calculator to Find the Confidence interval for the true Population Mean if a sample of 54 has a mean of 27.8 and a Standard Deviation of 13, use a 90% level of confidence (calculator). 4) Find the sample size need to find the Population Mean if the margin of error is $110, the confidence level is 95%, and the Standard Deviation is $305. (Solve)

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