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Confidence interval for the population mean

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Reference no: EM132581576

A simple random sample with n = 55 provided a sample mean of 28.5 and a sample standard deviation of 4.4. (Round your answers to one decimal place.)

(a) Develop a 90% confidence interval for the population mean.

(b) Develop a 95% confidence interval for the population mean.

(c) Develop a 99% confidence interval for the population mean.

(d) What happens to the margin of error and the confidence interval as the confidence level is increased? Choose Correct Response

-As the confidence level increases, there is a larger margin of error and a more narrow confidence interval.

-As the confidence level increases, there is a smaller margin of error and a wider confidence interval.

-As the confidence level increases, there is a smaller margin of error and a more narrow confidence interval.

-As the confidence level increases, there is a larger margin of error and a wider confidence interval.

Reference no: EM132581576

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