Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 12 mortgage institutions, the mean interest rate was 3.49% and the standard deviation was 0.31%. Assume the interest rates are normally distributed. Which distribution should be used to construct the confidence interval? OA. Use a normal distribution because the interest rates are normally distributed and a is known. OB. Use a normal distribution because n <30 and the interest rates are normally distributed. OC. Use a t-distribution because the interest rates are normally distributed and a is known. OD. Use a t-distribution because it is a random sample, a is unknown, and the interest rates are normally distributed. OE. Cannot use the standard normal distribution or the t-distribution because o is unknown, n<30, and the interest rates are not normally distributed. Select the correct choice below and, if necessary, fill in any answer boxes to complete your choice. QA. The 99% confidence interval is (Round to two decimal places as needed) B. Neither distribution can be used to construct the confidence interval. Interpret the results. Choose the correct answer below.

Q: (-14) + (–7)

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