Confidence Interval Help?

In order to estimate the mean 30-year fixed mortgage rate for a home loan in the United States, a random sample of 11 recent loans is taken. The average calculated from this sample is 5.70%. It can be assumed that 30-year fixed mortgage rates are normally distributed with a standard deviation of 0.30%. Compute an... show more In order to estimate the mean 30-year fixed mortgage rate for a home loan in the United States, a random sample of 11 recent loans is taken. The average calculated from this sample is 5.70%. It can be assumed that 30-year fixed mortgage rates are normally distributed with a standard deviation of 0.30%. Compute an 90% and a 99% confidence interval for the population mean 30-year fixed mortgage rate.

Confidence Levels:

99%
90%
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