A sample mean is used to estimate a population mean. To obtain a margin of error of 1.5 at a confidence level of 95%, a sample size of 120 is needed. Would the required sample size be larger or smaller if the researcher wished to (a)increase the confidence level while keeping the same margin of error? (b)decrease the margin of error while keeping the same confidence level? Explain your answers.

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The Answer of A sample mean is used to estimate a population mean. To obtain a margin of error of 1.5 at a confidence level of 95%, a sample size of 120 is needed. Would the required sample size be larger or smaller if the researcher wished to (a)increase the confidence level while keeping the same margin of error? (b)decrease the margin of error while keeping the same confidence level? Explain your answers.

A Sample Mean Is Used to Estimate a Population Mean