Practice Final A WI 2011

# For any normal distribution how many standard

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16. For any normal distribution, how many standard deviations do you have to be away from the mean, on either side, in order to have the probability between your two values be 90%? a. More than 1.96 b. 1.96 c. Less than 1.96 4

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17. Suppose Bob took two exams; one was a math exam whose mean was 70 and standard deviation was 10, and the other was a statistics exam whose mean was 80 and standard deviation was 5. Bob scored 90 on both exams. On which exam did he do better, compared to the rest of the class? 18. A survey asks 500 randomly selected U.S. taxpayers whether they have ever cheated on their taxes. Which of the following is an example of response bias in this situation? For #19-21: A researcher wants to study the effects of type of learning activity (computer activities vs. pencil and paper activities) on math scores for preschool children. Thirty preschool children will participate in her study; 15 children using computer activities (assigned at random) and 15 children using pencil and paper activities. After the activities are finished, the children are tested on math using 5 questions. The number of correct answers are recorded. 19. How many factors are in the preschool experiment? 20. What is the response variable in the preschool experiment? a. Type of activity (pencil/paper or computer) b. Score on the math test c. Age of the children d. None of the above. 21. Which of the following is a confounding variable in the preschool experiment? 22. What makes the margin of error of a confidence interval smaller? 23. Bob samples 100 OSU students going into a Stat 133 lecture and records whether or not each student is using an iPod. He finds that 67% of the students are using iPods. What type of variable has Bob collected data on? a. Numerical 5
b. Categorical 24. If the residual plot shows a straight line through (0,0) with slope 1, then there is a perfect linear relationship between X and Y.

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