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A simple random sample with n = 50 provided a sample mean of 23.5 and a sample standard deviation of 4.2. 


a. Develop a 90% confidence interval for the population mean (to 1 decimal). 

b. Develop a 95% confidence interval for the population mean (to 1 decimal). 

c. Develop a 99% confidence interval for the population mean (to 1 decimal). 

d. What happens to the margin of error and the confidence interval as the confidence level is increased? 

eBook A simple random sample with n = 50 provided a sample mean of 23.5 and a sample standard deviation of 4.2. a. Develop a


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