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Unformatted text preview: Sample Final Exam PSTAT 5E, Fall 2011 1. A group of 24 randomly selected students have a mean score of 30.8 with a standard deviation of 4.5 on a placement test. Assume that these data come from a population that is normally distributed. What is the 90% con dence interval for the mean score, , of all students taking the test? 2. The table below is from an study comparing people who regularly drink wine with dinner to those who do not regularly drink wine with dinner. In the survey, each person was asked whether they drink wine with dinner and also whether they usually fall asleep within 20 minutes of going to bed. Drink wine Do not drink wine Total Fall asleep within 20 min 65 125 190 Fall asleep after 20 min 25 85 110 Total 90 210 300 (a) Test whether drinking wine and falling asleep quickly are independent of one another at the = 0 . 05 level (b) From this test, can we say that drinking wine will cause one o fall asleep faster? 1 3. A study was done to see how washing hands may a ect chances of contracting common sicknesses like the cold or u. A random sample of 180 individuals were selected and asked whether they regular washthe cold or u....
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This note was uploaded on 12/26/2011 for the course PSTAT 5E taught by Professor Eduardomontoya during the Fall '08 term at UCSB.
 Fall '08
 EduardoMontoya

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