Midterm 1A practice

# If a residual is negative the actual data value for y

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18. If a residual is negative, the actual data value for Y was BELOW the regression line. a. TRUE b. FALSE 19. A double-blind study is one where the subjects do not know what treatment they are getting, and they don’t know all the possible outcomes that could occur as a result of that treatment. 4

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a. TRUE b. FALSE 20. The following boxplots show that data set #1 has more data than data set #2. 14 12 10 8 6 4 2 0 data set 1 data set 2 Boxplot of data set 1, data set 2 21. Which Data Set from the histograms below has the highest standard deviation? a. Data Set #1 b. Data Set #2 7 6 5 4 3 2 1 10 8 6 4 2 0 X Frequency Histogram of Data Set # 1 7 6 5 4 3 2 1 4 3 2 1 0 X Frequency Histogram of Data Set # 2 22. A large data set from a simple random sample contains less bias than a small data set from a simple random sample. (Assume data collection quality is same for both.) 23. Which of the following is NOT in the same units as the original data? 24. The residuals from a regression line are in the same units as the Y values. a. TRUE b. FALSE 5
25. It is possible to have a data set where Q1 is equal to the median. Use this information for problems 26-27: A teacher gives two quizzes in her class: Quiz 1 and Quiz 2. Each quiz has a total of 20 points. She notices that every single student scored half as many points on Quiz 2 as they did on Quiz 1. 26. What is the correlation between the scores on these two quizzes? 27. The slope of the regression line for this data set is: 28. A sample of 350 American families was surveyed and asked to report the amount of money (in dollars) spent annually on fruits and vegetables. The histogram of the data is below. Which of the following is the closest number to Q1 here? a. \$17.5 per year b. \$225 per year c. \$350 per year d. \$25 per year Dollars Frequency 800 700 600 500 400 300 200 100 70 60 50 40 30 20 10 0 Amount of \$ spent annually on fruits and vegetables

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