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Question
At the end of 1990, 1991, and 1992, the average prices of a share of stock in a 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 percent confidence interval.A. [27.646, 39.523]
B. [26.732, 40.434]
C. [32.514, 34.651]
D. [32.533, 34.633]
E. [32.269, 34.897]
Answer
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