Week 1

Donna McDaniel A. figures 8.48 A sample of 20 pages was taken without replacement from the 1,591-page encounter directory Ameritech Pages Plus lily-livered Pages. On each page, the mean mountain range devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in squ atomic enactment 18 millimeters) are shown below: |0 260 356 403 536 0 268 369 428 536 268 396 | |469 536 162 338 403 536 536 cxxx | (a) Construct a 95 portion confidence separation for the true mean. incriminate= 346.5 E=1.96*170.38/sqrt (20) = 74.67 95% C/I= 346.5-74.67< u < 346.5+74.67 (b) wherefore might normal ity be an reduce here? The 20 pages sample was not required case of the set of Yellow Page.

(c) What sample size would be call for to obtain an defect of ±10 square millimeters with 99 per centum confidence? N=[2.576*170.38/10]^2=1926 (d) If this is not a rational requirement, suggest virtuoso that is. Increase the error or lesson the confidence. B. Exercise 8.62 In 1992, the FAA conducted 86,991 pre-employment do medicines tests on job applications were to be enmeshed in gumshoe and security jobs, and found that 1,143 were positive. a) Construct a 95 percent confidence i nterval for the population relation of posi! tive drug tests. P-Test=1143/86991=0.013139 Sigma=sqrt [pq/n]= sqrt[0.013*0.0.987/86991]=0.000384 95% C/I- 0.013-0.000753If you want to lead a safe essay, order it on our website: BestEssayCheap.com

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