Practice Final A WI 2011 SOLNS

How many factors are in the preschool experiment a 30

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19. How many factors are in the preschool experiment? a. 30 b. 2 c. 1 d. None of the above 20. What is the response variable in the preschool experiment? 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 b. Categorical 3
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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. a. True b. False 25. If the normal probability plot shows a straight line through (0,0) with slope 1, then: a. The data have a linear relationship. b. The data has a normal distribution. c. None of the above. 26. Suppose you have two scatterplots; the first one has points lining up perfectly, going uphill with a slope of 10. The second scatterplot has points lining up perfectly going uphill with a slope of 1/10. Which scatterplot has a higher correlation? 27. Suppose you want to determine the percentage of students in our class who are looking for an internship for next year. Taking a stratified random sample of 50 men and 50 women and finding the overall percentage looking for an internship would be a good sampling plan. a. YES b. NO
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