Exercises 8.48

A. Exercises 8.48 A archetype of 20 pages was taken without replacement from the 1,591-page crab up directory Ameritech Pages Plus Yellow Pages. On each page, the think about empyrean devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in squ be millimeters) are shown below: |0 260 356 403 536 0 268 369 428 536 268 396 | |469 536 162 338 403 536 536 130 | (a) prepare a 95 percentage faith interval for the honest mean. (Mean= 346.5), (E=1.96*170.38/sqrt (20) = 74.67), (95% C/I= 346.5-74.67< u < 346.5+74.67) (b) Why might nitrogen be an issue here? The CI (confidence interval) is a av erment more or less the whole creation. In the random sample provided by our assignment, I believe it does non pit to the whole population. So the 20 page sample was not necessitate or vocalization of the set of Yellow Pages.

(c) What sample size would be mandatory to obtain an error of ±10 square millimeters with 99 percent confidence? n = [t*s/E] n = [2.093*170.378/10]^2 = 1271.64 n = 1272 (when rounded up) (d) If this is not a reasonable requirement, suggest 1 that is. A 99% confidence level is not lawful for a distribution that is credibly not normal. dropping it (confidence level) to a 90%, wo uld reduce the required sample size to a mor! e sensible and pragmatic answer. B. Exercise 8.62 In 1992, the FAA conducted 86,991 pre-employment medicine tests on job applicants who were to be engaged in gum elastic and security-related jobs, and found that 1,143 were positive. a) shape a 95 percent confidence interval for the population isotropy of positive drug tests. The radiation diagram is E=z\cdot \sqrt{\frac{\hat{p}(1-\hat{p})}{n}} So for a 95% CI, z=1.96 The proportion who time-tested positive is obviously...If you want to get a salutary essay, grade it on our website: OrderCustomPaper.com

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