The scientific productivity of major world cities was the subject of a recent study. The study determined the number of scientific papers published between 1994 and 1997 by researchers from each of the 20 world cities, and is shown below. City Number of papers City Number of papers City 1 15 City 11 5 City 2 3 City 12 19 City 3 3 City 13 8 City 4 30 City 14 30 City 5 3 City 15 10 City 6 10 City 16 4 City 7 20 City 17 15 City 8 21 City 18 15 City 9 City 19 13 City 10 City 20 19 19 <μ< 4 Construct a 99% confidence interval for the average number of papers published in major world cities.

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