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Practice Midterm 1 Questions SP10

A simple random sample b volunteer sample c

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a. Simple random sample b. Volunteer sample c. Stratified sample 11. Forbes magazine conducted a survey to determine the secrets of success of the top 1,000 CEOs in the world. They selected 100 CEOs from this group at random and 50 of them respond to the survey. Which of the following is the population of interest? a. All the CEOs in the world b. The top 1,000 CEOs in the world c. The 100 CEOs selected d. The 50 CEOs who responded 12. If a strong linear relationship is found between X and Y and a well-designed experiment was conducted to explore that relationship, we can conclude that a change in Y is CAUSED by a change in X. a. True b. False 2

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13. If a histogram is skewed left, then less than 50% of the data is below the median . a. TRUE b. FALSE 14. If a histogram is skewed left, then less than 50% of the data is below the mean. b. TRUE b. FALSE 15. A small data set was summarized using Minitab; the output is below. Which of the following data sets matches these descriptive statistics? Descriptive Statistics: X Variable Mean StDev X 10.0000 0.000000000 a. 8, 9, 10, 11, 12 b. 0, 0, 10, 10 c. 0, 0, 0, 0, 0 d. None of the above For problems 16-18. Here are data for calories and salt content (milligrams of sodium) in 17 brands of meat hot dogs: Sodium (mg) Calories 600 500 400 300 200 100 200 180 160 140 120 100 Scatterplot of Calories vs Sodium (mg) 16. A computer found the regression equation for the above problem is Calories = 61.6 + 0.232 Sodium (mg). How do we interpret the slope of this line? a. As the amount of sodium increases by 1 milligram, calories increase by 0.232 b. As the amount of sodium increases by 1 milligram, calories increase by 61.6 c. As the amount of calories increases by 1, sodium increases by 0.232 milligrams d. As the amount of calories increases by 1, sodium increases by 61.6 milligrams. 17. The Y-intercept in this case _______ a reasonable interpretation. a. has b. does not have 3
18. This data set contains one brand of hot dog that is both low-calorie and low-sodium. From a statistical perspective we consider this to be an influential point. a. TRUE b. FALSE 19. Match the correlation to its corresponding scatterplot below and circle the best answer. The correlations for these scatterplots (not necessarily in order) are: .90, .39, and -.74. Scatterplot # 1

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a Simple random sample b Volunteer sample c Stratified...

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