Stat 119 f07 final exam

Stat 119 f07 final exam - Instructor_ Class Meeting Time_...

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Instructor____________________ Name_______________________ Class Meeting Time___________ Red Id:____________________ STAT 119 FINAL EXAM December 8, 2007 Form A You have two hours to complete this exam. Mark your answers neatly on the exam and be sure to show all your work . Please round your answers to four digits after the decimal. Make sure to put your final answers neatly within the answer boxes (when provided). Please CIRCLE the correct answer and use CAPITAL LETTERS in the space provided for the multiple choice. BE CAREFUL! GOOD LUCK! Page 1 Total________ Page 2 Total________ ________ Page 3 Total________ ________ Page 4 Total________ ________ Page 5 Total________ Page 6 Total________ Page 7 Total________ Page 8 Total________ Page 9 Total________ Page 10 Total________ Page 11 Total________ Page 12 Total________ Total_____________________
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A Use the following information to answer problems 1-2 (19 points): The national average for the 7 th grade aptitude test in 2004 was 86. The principal at O’Farrell Middle School feels that the average for his students this year will be different. He randomly selected nine students to take the aptitude test. Their scores were: 83.9 73.7 82.1 88.5 87.2 83.3 85.6 79.2 80.3 1. (3 points) State the appropriate null and alternative hypotheses. 2. Conduct a test of the hypotheses identified above. I. (6 points) Calculate the test statistic Answer: II. (4 points) Calculate the corresponding p-value. Answer: III. (3 points) Make a statistical decision using level of significance of 0.01. Justify your decision. IV. (3 points) Interpret your decision in the context of the problem. Total: ________(19) 2
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A Use the following information to answer problems 3-5 (11 points): Cocaine addiction is hard to break. Addicts need cocaine to feel any pleasure, so researchers believe that giving them an antidepressant drug will help. An experiment assigned 72 chronic cocaine users to take either an antidepressant drug called desipramine, lithium, or a placebo. One-third of the subjects, chosen at random, received each drug. Here are the results after 3 years. Desipramine Lithium Placebo Total Relapse 10 18 20 48 No Relapse 14 6 4 24 Total 24 24 24 72 3. (3 points) What proportion of subjects relapsed? Answer: 4. (4 points) Of the subjects that took Desipramine, what proportion did not relapse? Answer: 5. (4 points) What proportion of subjects took Lithium or relapsed? Answer: Use the following information to answer problems 6-7 (9 points): A rapid test for the presence in the blood of antibodies to HIV, the virus that causes AIDS, gives a positive result with probability about 0.004 when a person who is free of HIV antibodies is tested. This is called a false positive. A clinic tests 5000 people who are all free of HIV antibodies. 6. (3 points) Describe the distribution of the number of positive tests by filling in the spaces below X ~ _______( _____________ , _____________) 7. (6 points) What is the probability that between 10 and 15 people in this sample will receive a false positive reading? Answer: Total: ________(20) 3
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A Use the following information to answer problems 8-9 (9 points): A study of unexcused absenteeism among factory workers looked at a year’s records for 65 workers in an English factory and found the mean number of days absent was 9.88. Regard these
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This note was uploaded on 02/15/2008 for the course STAT 119 taught by Professor Larking during the Fall '03 term at UCSD.

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Stat 119 f07 final exam - Instructor_ Class Meeting Time_...

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