Question: 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.

1. [27.832 39.334]
2. [26.732 40.434]
3. [32.514 34.651]
4. [32.533 34.633]
5. [32.269 34.897]

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