Sample size to estimate the population mean

Reference no: EM1315196

A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square millimeters) are shown below:

0	260	356	403	536	0	268	369	428	536
268	396	469	536	162	338	403	536	536	130

What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?

Reference no: EM1315196

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