# Test 12B - Test 12B AP Statistics Name Directions Work on...

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Test 12B AP Statistics Name: Directions: Work on these sheets. Answer completely, but be concise. A normal probability table is attached . Part 1: Multiple Choice. Circle the letter corresponding to the best answer. 1. Some scientists believe that a new drug would benefit about half of all people with a certain blood disorder. To estimate the proportion of patients who would benefit from taking the drug, the scientists will administer it to a random sample of patients who have the blood disorder. What sample size is needed so that the 95% confidence interval will have a width of 0.06? (a) 748 (b) 1,068 (c) 1,503 (d) 2,056 (e) 2,401 2. A random sample of 900 individuals has been selected from a large population. It was found that 180 are regular users of vitamins. Thus, the proportion of the regular users of vitamins in the population is estimated to be 0.20. The standard error of this estimate is approximately: (a) 0.1600 (b) 0.0002 (c) 0.4000 (d) 0.0133 (e) 0.0267 3. The college newspaper of a large Midwestern university periodically conducts a survey of students on campus to determine the attitude on campus concerning issues of interest. Pictures of the students interviewed along with quotes of their responses are printed in the paper. Students are interviewed by a reporter “roaming” the campus selecting students to interview “haphazardly.” On a particular day the reporter interviews five students and asks them if they feel there is adequate student parking on campus. Four of the students say no. Which of the following conditions for inference about a proportion using a confidence interval are

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Test 12B - Test 12B AP Statistics Name Directions Work on...

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