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Suppose a random sample of 50 basketball players have an average height of 78 inches. Also...

Suppose a random sample of 50 basketball players have an average height of 78 inches. Also assume that the population standard deviation is 1.5 inches.

a) Find a 99% confidence interval for the population mean height.

b) Find a 95% confidence interval for the population mean height.

c) Find a 90% confidence interval for the population mean height.

d) Find an 80% confidence interval for the population mean height.

e) What do you notice about the length of the confidence interval as the confidence level goes down? If you used a confidence level of 70%, would you expect the confidence interval to be longer or shorter than that of 80%?

f) What is the 70% confidence interval?

Math   Statistics-And-Probability   
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