A sample of n = 9 scores is obtained from an unknown population. The sample mean is M = 46 with a st


Question: A sample of n = 9 scores is obtained from an unknown population. The sample mean is M = 46 with a standard deviation of s = 6.

a. Use the sample data to make an 80 % confidence interval estimate of the unknown population mean.


b. Make a 90% confidence interval estimate of \(\mu \)


c. Make a 95 % confidence interval estimate of \(\mu \).


d. In general, how is the width of a confidence interval related to the percentage of confidence?

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