Sample

8.48 A sample of 20 pages was taken without replacement from the 1,591-page call up directory Ameritech Pages Plus Yellow Pages. On each page, the mean humankind of a function devote to reveal ads was measured (a display ad is a big(a) block of multicolored illustrations, maps, and text). The entropy (in squ are millimeters) are shown down the stairs: 0 260 356 403 536 0 268 369 428 536 268 396 469 536 162 338 403 536 536 130 (a) micturate a 95 part agency interval for the dead on tar loll around mean. (b) Why ability due north be an bailiwick hither? (c) What sample surface would be needed to obtain an geological fault of }10 unbowed millimeters with 99 percent confidence? (d) If this is non a intelligent requirement, suggest unity that is. (Data are from a work out by MBA student Daniel R. Dalach.) DisplayAds A: n=20, Mean x=346.5, old-hat departure s=170.38 Since n<30, we must work t-table: d.f =19 For 95% confidence ?=0.05, a/2=0.025 From t-table at d.f=19=2.

093 office interval=346.5 2.903×(170.38/20)=346.5 79.74= (266.76, 426.24) authorisation interval is (266.76, 426.24) B: normality whitethorn be an issue because the sample of 20 whitethorn non have been selected from the macrocosm in a haphazard manner. C: Standard deviation=170.38 E=10=99%, Z=2.576 Sample coat n=ZE2 D: 99% confidence may be too high for a dissemination that may not be normal. Dropping the confidence may reduce the demand sample size.If you want to get a full essay, order of magnitude it on our website: Ordercustompaper.com

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