Etext 8.46

8.46-A random sample of 10 miniature tootsie rolls was taken from a bag. Each piece was weighed on a really read scale. The results in grams were: 3.087, 3.131, 3.241, 3.270, 3.353, 3.400, 3.411, 3.437, 3.477 (a) Construct a 90% sanction legal separation for the true mean weight. Sample mean = 3.3048 Sample threadbare deviation = 0.13199 Standard error: 1.645*0.13199/Sqrt(10) = 0.06866 90% CI- 3.3048-0.06866 < u < 3.3048 + 0.06866 90% CI- 3.23614 < u < 3.37346 (b) What sample size would be necessary to ideate the true weight with an error rate of +/- 0.03 grams with 90% potency? n = [1.645*0.13199/0.03]^2 = 7.42^2 = 52.38 Rounding up to prime for n = 53 (c) Discuss the factors which might cause genetic mutation in the weight of the tootsie rolls during manufacturing. Factors such as the amount of ingredients employ to pick out the tootsie rolls along with the humidity and temperature control. Also the auto tolerances may be a factor in create v ariation during manufacturing. 8.

62- In 1992, the FAA conducted 86,991 pre-employment drug tests on the job applicants who were to be engaged in safety and security related jobs, and assemble that 1,143 were absolute. (a) Construct a 95% confidence interval for the creation proportion of positive drug tests. p-hat = 1143/86991 = 0.013139... E = 1.96*sqrt[(0.013139)*(0.98686)/86991] = 0.002393 CI is (0.013139 0.002393, 0.013139 + 0.00239) (b) why is the normality speculation not a line of work, condescension the very small care for of p? The normality confidence was not a problem because the rando m sample was very large.If you want to get a! full essay, order it on our website: BestEssayCheap.com

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