f98exm2a - COURSE: MSCI 3710 EXAM 2 Version A SEMESTER:...

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COURSE: MSCI 3710 Print Name: EXAM 2 Signature: Version A S.S.#: SEMESTER: Fall 1998 Seat Number: Note: Whenever question(s) are connected you may be asked to assume a result (given a value) from the previous question but this result may or may not be correct. This is to prevent you from losing points on a second question because you made a mistake on a previous question.
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Case I: The following information pertains to the next six questions An environmentalist, concerned about the way things are going, wants to find out the fraction of oil tankers that have spills each month. She believes the fraction is about .18. 1. How large a sample would be required to estimate, at the 98% confidence level with an error of at most .06, the fraction of oil tankers that have spills each month? A. 223 B. 564 C. 1000 D. 500 E. 400 2. Suppose a sample of 600 tankers is selected. Of these ships, 482 did not have spills. Using these data, what is your estimate of the population proportion of oil tankers that had spills? A. .236 B. .764 C. .564 D. .197 E. .803 3. If a sample of 600 is selected construct the 90% confidence interval for the population proportion of oil tankers that have spills if 118 in this sample had spills. A. .2056 to .2906 B. .1917 to .2803 C. .1703 to .2237 D. .7268 to .8012 E. .7197 to .8083 4. The oil companies disagree with the environmentalist. They claim that the fraction of oil tankers that have spills each month is not equal to .18. Suppose in a sample of 600 tankers 118 had spills. What is the calculated value of the test statistic to test the claim of the oil companies? A. 0.1967 B. 0.18 C. 1.084 D. 1.225 E. 2.035 5. What is the critical (table) value at the 0.05 level of significance to test the claim of the oil companies?
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A. 2.58 B. 1.96 C. 1.645 D. 1.28 E. 0.45 6. What is your conclusion for this test at the 0.05 level of significance, assuming the calculated value for the test statistic is 1.065? A.
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This note was uploaded on 03/09/2011 for the course DSCI 3710 taught by Professor Dr.jay during the Spring '08 term at North Texas.

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f98exm2a - COURSE: MSCI 3710 EXAM 2 Version A SEMESTER:...

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