Question: 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

1. Construct a 95 percent confidence interval for the true mean.
2. Why might normality be an issue here?
3. What sample size would be needed to obtain an error of ± 10 square millimeters with 99 percent confidence?
4. If this is not a reasonable requirement, suggest one that is.

Price: $2.99

Solution: The downloadable solution consists of 2 pages
Deliverable: Word Document