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Unformatted text preview: with an error of u } 0.03 grams with 90 percent confidence? (c) Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture. (Data are from a project by MBA student Henry Scussel.) Answer: EXERCISES FROM THE ETEXT 3 8.62 In 1992, the FAA conducted 86,991 preemployment drug tests on job applicants who were to be engaged in safety and securityrelated jobs, and found that 1,143 were positive. (a) Construct a 95 percent confidence interval for the population proportion of positive drug tests. (b) Why is the normality assumption not a problem, despite the very small value of p ? (Data are from Flying 120, no. 11 [November 1993], p. 1.) Answer: EXERCISES FROM THE ETEXT 4 Reference Doane, D. P., & Seward, L. E. (2007). Applied statistics in business and economics . Boston, MA: McGrawHill/Irwin....
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 Spring '10
 PARKES
 Statistics, Normal Distribution, Valuation, percent confidence interval, Tootsie Rolls

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