E-Text

E-Text DAinsley T. Smith RES/342 August 28, 2011 Walt Deckert E-Text Chapter suffice Exercise: 8.48 A consider of 20 pages was taken without replacement from the 1,591-page strait directory Ameritech Pages Plus jaundiced Pages. On each page, the mean genus Ara devoted to demonstrate ads was measured (a display as is a large draw a blank of multicolored illustrations, maps, and text). The info (in squ ar millimeters) are shown infra: 02603564035360268369428536 268396469536162338403536536130 (a) Construct a 95 percent trustfulness interval for the true mean. (b)Why might due north be an core here? (c) What sample size would be needed to chance an error of ±10 square millimeters with 99 percent authority? (d) If this is not a reasonable requirement, kick up one that is. (Data are from a project by MBA scholarly person Daniel R. Dalach.) A. As the race variance is understood and the test order is smaller, I wll give the t-distribution. Excel Megastat computations are as below: 95%| corporate trust level| 346.5| mean| 170.38| standardised. deviation.| 20| n| 2.093| t (df = 19)| 79.740| half-width| 426.240| hurrying arrogance limit| 266.760| debase confidence limit| So, a 95 % assurance interval is between 266.760 and 426.240. B.

Normality could be a problem because at that place are extreme figures (0s) in the facts set. This impart impact the precision of the assurance intervals. C. As we dont have the measurements and sample magnitude, I will choose the z-distribution. Excel Megastat computations are listed below: 99%| confidence level| 346.50| mean| 170.38| std. dev.| 20| n| 2.576| z| ! 98.134| half-width| 444.634| upper confidence limit| 248.366| lower confidence limit| With a confidence interval of 99 %, the z-score is 2.576. An effective method to bemuse our answer is: (z-value X standard deviation/10)2 (2.576 X 170.38/10)2 =...If you require to get a all-inclusive essay, order it on our website: OrderEssay.net

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