This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: 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 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? A. 2305 B. 294 C. 406 D. 577 E. 601 4. We would like to know if on average, a man has more strength than a woman. A special program can give an accessment and the result is the following. The appropriate hypothesis Men n = 6 ¯ x = 40 . 3 s = 11 . 3 Women n = 8 ¯ x = 21 . 4 s = 8 . 3 for the above test is: A. H : μ 1 = μ 2 vs H a : μ 1 μ 2 < B. H :...
View
Full
Document
This note was uploaded on 09/24/2011 for the course STAT 211 taught by Professor Parzen during the Spring '07 term at Texas A&M.
 Spring '07
 Parzen

Click to edit the document details