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.