Exercises From the E

Exercises From the E - with an error of u } 0.03 grams with...

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Running head: EXERCISES FROM THE E-TEXT 1 Exercises from the E-Text RES/341 August 11, 2011 Darron Williams
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EXERCISES FROM THE E-TEXT 2 Exercises from the E-Text 5. State the main points of the Central Limit Theorem for a mean. Answer: According to T he Central Limit Theorem (CLT) states that the sample mean u x is centered at μ and follows a normal distribution if n is large, regardless of the population shape”(p. 337). 6. Why is population shape of concern when estimating a mean? What does sample size have to do with it? Answer: 8.46 A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very 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) Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight
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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 E-TEXT 3 8.62 In 1992, the FAA conducted 86,991 pre-employment drug tests on job applicants who were to be engaged in safety and security-related 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 E-TEXT 4 Reference Doane, D. P., & Seward, L. E. (2007). Applied statistics in business and economics . Boston, MA: McGraw-Hill/Irwin....
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Exercises From the E - with an error of u } 0.03 grams with...

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