A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. One each page the mean area devoted to display ads was measured ( a display ad is a large block of multicolered 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
(a)Construct a 95 percent confidence interval for the true mean. (b)Why might normality be an issue here? (c)What sample size would be needed to obtain an error of +/- square millimeters with 99 percent confidence? (d)If this is not a reasonable requirement suggest one that is.
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