114. At the end of 1990, 1991, and 1992 the average prices of a share of stock in a money market portfolio were $34.83, $34.65 and $31.26 respectively. To investigate the average share price at the end of 1993, a random sample of 30 stocks was drawn and their closing prices on the last trading day of 1993 were observed with a mean of 33.583 and a standard deviation of 19.149. Estimate the average price of a share of stock in the portfolio at the end of 1993 with a 90% confidence interval. A) [27.832 39.334] B) [26.732 40.434] C) [32.514 34.651] D) [32.533 34.633] E) [32.269 34.897] Answer: A Difficulty: Medium