document.write( "Question 200319: A sample of 20 pages was taken without replacement from the 1,591-page phone directory
\n" ); document.write( "Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured
\n" ); document.write( "(a display ad is a large block of multicolored illustrations, maps, and text). The data (in
\n" ); document.write( "square millimeters) are shown below:
\n" ); document.write( "0 260 356 403 536 0 268 369 428 536
\n" ); document.write( "268 396 469 536 162 338 403 536 536 130
\n" ); document.write( "(a) Construct a 95 percent confidence interval for the true mean. (b) Why might normality be an
\n" ); document.write( "issue here? (c) What sample size would be needed to obtain an error of ±10 square millimeters
\n" ); document.write( "with 99 percent confidence? (d) If this is not a reasonable requirement, suggest one that is. \n" ); document.write( "
Algebra.Com's Answer #150599 by jim_thompson5910(35256)\"\" \"About 
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