Res 341 Wk 5 E-Text

8.46 A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a rattling accurate scale. The results in grams were 3.087 3.131 3.241 3.241 3.270 3.353 3.400 3.411 3.437 3.477 (a) throw a 90 per centum faith detachment for the true mean slant. The standard computer error is E = 1.96(s/sqrt(n)) = 1.96[0.131989/sqrt(10)]=1.96*0.41739 =0.081808 C.I. = (x-bar-E,x-bar+E) = (3.3048-0.0818,3.3048+0.0818) (b) What sample size would be necessary to bespeak the true cant over with an error of ± 0.03 grams with 90 part confidence? n=[z*s/E]^2 n=[1.645*0.131989/0.03]^2 = 52.38; rounding up, n=53 (c) Discuss the cistrons which might get under ones skin variation in the weight of Tootsie Rolls during manufacture. (Data are from a stick out by MBA student hydrogen Scussel.) There are galore(post nary(prenominal)inal) factors that can influence weight variation in the exertion of Tootsie Rolls. The equipment that the Tootsie Rolls a re manufactured on could be a factor if they are not adjust properly or as required. The speed of the equipment or the al-Quran of the candy that is fed into the carver could also influence the weight. Additionally, in that respect could also be a weight variation if there is a version in the temperature. 8.

62 In 1992, the FAA conducted 86,991 pre-employment drug tests on business line applicants who were to be engaged in safety and security-related jobs, and effectuate that 1,143 were positive. (a) Construct a 95 percent confidence interval for the world proportion of positive drug tests. E = 1.96*sqrt [0.01314*(1-0.01314)/86,991] = 0.0007567.. 95% CI: 0.79615, 83671 (b) Why is the normality assumption not a ! puzzle, disdain the very micro value of p? (Data is from trajectory 120, no. 11 [November 1993], p. 31.) The normality assumption is not a problem because the sample size is very large. Additionally, even though the small value of p, p is normally distributed by the fundamental keep back Theorem.If you want to get a full essay, piece it on our website: OrderEssay.net

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