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Excel final exam - Math 1107-Elementary Statistics Exam...

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Math 1107--Elementary Statistics Exam 3--Chapters 19 & 20 Name This test should be an individual effort. DO NOT work with anyone else on this test!!! Please make sure to record your answers for problems 1-12 on the answer sheet. Test is due by Tuesday, May 5, 2010!! 1. A survey found that 89% of a random sample of 1024 American adults approved of cloning endangered animals. Find the margin of error for this survey if we want 90% confidence in our estimate of the percent of American adults who approve of cloning endangered animals. a. 1.92% b. 1.61% c. 16.50% d. 4.85% e. 5.78% 2. A survey of 300 union members in New York State reveals that 112 favor the Republican candidate for governor. Construct a 98% confidence interval for the percentage of all New York State union members who favor the Republican candidate. 3. When 293 college students are randomly selected and surveyed, it is found that 114 own a car. Construct a 99% confidence interval for the percentage of all college students who own a car.
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4. A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 90% confident that the true proportion is estimated to within 1.5%?
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