Find the confidence interval for single mean

Reference no: EM1321376

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, 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% confidence interval for the true mean.

b) What might normality be an issue here?

c) What sample size would be needed to obtain an error of +/- 10 square millimeters with 99% confidence?

d) If this is not a reasonable requirement, suggest one that is.

Reference no: EM1321376

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