Question 214372: Please show work on how you solved confidence interval problem. A sample of 20 pages was taken withreplacement 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 ofmulticolored illustrations, maps, and text). The data (in sqaure milltimeters) are shown.
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 innterval for the true mean. b. Why might normality be an issue here? c. What sample size would be needed to obtanin an error of =+ 10 square millimeters with 99 percent confidence? d. If this is not a reasonble suggest one that is
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Please show work on how you solved confidence interval problem. A sample of 20 pages was taken withreplacement 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.
0 260 356 403 536 0 268 369 428 536
268 396 469 536 162 338 403 536 536 130
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a. Construct a 95 percent confidence innterval for the true mean.
sample mean = 325.35 standard deviation = 180.34
standard error: t[s/sqrt(n)] = 2.086
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