Practice Final A WI 2011 SOLNS

# A yes b no descriptive statistics mpg variable count

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a) YES b) NO Descriptive Statistics: MPG Variable Count Mean StDev Minimum Q1 Median Q3 Maximum MPG 32 26.750 2.874 22.000 24.000 26.500 28.750 33.00 MPG Frequency 32 30 28 26 24 22 7 6 5 4 3 2 1 0 Histogram of MPG 15. Suppose salaries have a distribution such that most employees have close to the same salary, fewer and fewer have lower and lower salaries, and there are no large salaries due to the economy. Which of the following is most likely to be the shape of the distribution of salaries? a. Skewed right b. Skewed left c. Symmetric 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%? 2

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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.
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