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Math Help - Applied statistics

  1. #1
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    Applied statistics

    A sample of 20 pages was taken w/o replacement from the 1,591 page phone directory . 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
    268 396 469 536 162 338 403 536 130

    a) Construct a 95 percent confidence interval for the true mean b) why might normaility be an issue here c) what sample woud be needed to obtain an error of 10 square millimeters
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  2. #2
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    Quote Originally Posted by JorJasKi View Post
    A sample of 20 pages was taken w/o replacement from the 1,591 page phone directory . 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
    268 396 469 536 162 338 403 536 130

    a) Construct a 95 percent confidence interval for the true mean b) why might normaility be an issue here c) what sample woud be needed to obtain an error of 10 square millimeters
    The same question has been asked by a different member. The answer is here: http://www.mathhelpforum.com/math-he...tion-help.html
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