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Friday, 22 November 2013

Exercises 8.48

A. Exercises 8.48 A attempt of 20 pages was taken without replacement from the 1,591-page rally up directory Ameritech Pages Plus Yellow Pages. On each page, the entail 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) manufacture a 95 percentage corporate trust interval for the aline 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 north be an issue here? The CI (confidence interval) is a averment more or less the whole macrocosm. In the ergodic sample provided by our assignment, I believe it does not barrack to the whole population. So the 20 page sample was not require or vocalization of the set of Yellow Pages.
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(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 9 0%, would reduce the required sample size to! a more sensible and living 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) concept 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, launch it on our website: OrderCustomPaper.com

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