18. The following data give the average price of all books reviewed in the journal Science in the years from 1990 to 1996.

Give an interval that, with 95 percent confidence, will contain the average price of all books reviewed in Science in 1997.
Problems 19 through 23 refer to the following data relating cigarette smoking and death rates for 4 types of cancers in 14 states. The data are based in part on records concerning 1960 cigarette tax receipts.

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Price (Dollars) 1990 1991 1992 1993 1994 1995 1996 54.43 54.08 57.58 51.21 59.96 60.52 62.13