Question: Use the normal distribution or the t-distribution to construct a 90% and 99% confidence interval for the population mean. Justify your answer. If neither distribution

Use the normal distribution or the t-distribution to construct a 90% and 99% confidence interval for the population mean. Justify your answer. If neither distribution can be used, explain why. Interpret the results and compare the widths of the confidence intervals.

In a random sample of 15 mortgage institutions, the mean interest rate was 4.99% and the standard deviation was 6.12. Assume the interest rates are normally distributed

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