Statistics - Confidence Interval - True Mean
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A sample of 20 pages was taken without replacement from the 1,591 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
(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 ± 10 square millimeters with 99 percent confidence? (d) If this is not a reasonable requirement, suggest one that is.
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