sample3_solution

# sample3_solution - Sample Final Exam STAT 211(Fall 2009...

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Sample Final Exam STAT 211 (Fall 2009) Name : Student ID : You have 120 minutes to complete this test. You may use any resource you have available (calculator, three cheat sheets, any tables)– but you must work alone. If I provide partial results—assume they are correct and use them even if they are not. If there is no correct answer or if multiple answers are correct, select the best answer. Normal, T and F tables are provided at the class website. This test consists of 20 questions. Make sure you have all questions and Good luck! 1

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1. A random variable X can take values 9 4 7 8 2 10, with probability 0.1751 0.1943 0.0721 0.1688 0.2866 0.1031. What is the mean and variance of X ? A. 0.9688, 6.2424 B. 5.8125, 9.3004 C. 0.9688, 1.5500 D. 5.8125, 43.0852 E. None of the above 2. Usually, a student solves 6 problems per hour. What is the chance that the student can solve 8 problems in a one hour exam? A. 0.1396 B. 0.0655 C. 0.1221 D. 0.1033 E. 0.0481 3. You need to conduct a survey for the public’s opnion on economy. Recent surveys indicate that more than 60% of the Americans are pessimistic. If you want the poll to have a 95% confident interval of ± 4%, how many people will you need to poll?
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