Practice Midterm 1 Questions SP10

# Bob took one random sample of 100 osu students and

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10. Bob took one random sample of 100 OSU students and collected data on gender and whether or not they were full time students. When he summarized the data he found there were 40% males and 60% females. He also found that 79% of males were full time and 88% of females were full time. What type of sample did Bob use? 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? 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. 2

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13. If a histogram is skewed left, then less than 50% of the data is below the median . 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? 17. The Y-intercept in this case _______ a reasonable interpretation.
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