Use the standard normal distribution or the t-distribution to construct a 9 9% condence interval for the population mean. Justify your decision. If neither distribution can be usedI explain why. Interpret the result In a random sample of 14 mortgage institutions, the mean interest rate was 3.53% and the standard deviation was 0.36%. Assume the interest rates are normally distributed. Which distribution should he used to construct the condence interval? 0 A. O B. O c. O 'D. O E. Use a normal distribution because the interest rates are normally distributed and e is known. Use a Histribution because it is a random sample, a is unknown, and the interest rates are normally distributed. k Use a normal distribution because n