# exam1solution - Stat-312 Mid-term Exam One Instructor Lie...

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Stat-312 Mid-term Exam OneInstructor: Lie XiongData: 02/26/14 Time Limit: 75 MinutesName (Print):This exam contains 6 pages (including this cover page) and 5 problems. Check to see if any pagesare missing. Enter all requested information on the top of this page. You are required to show allrelevant formulas and work on each problem in this exam.Scores may be useful for your calculation:z0.01= 2.33,z0,025= 1.96,z0.05= 1.64,z0.1= 1.28t0.025,7= 2.36,t0.05,7= 1.89
Stat-312Mid-term Exam One - Page 2 of 602/26/141. (10 points) Complaints about rising prescription drug prices caused the U.S. Congress to con-sider laws that would force pharmaceutical companies to offer prescription discounts to seniorcitizens without drug benefits. The House Government Reform Committee provided data onthe prescription cost for some of the most widely used drugs (Newsweek, May 8, 2000). Assumethe following data show a sample of the prescription cost in dollars for Zocor, a drug used lowercholesterol: 110, 112, 115, 99, 100, 98, 104, 126. Given a normal population assumption,(a) (5 points) What is the 90% Confidence Interval for the population mean cost for a pre-scription of Zocor (to 2 decimals)?