STAT
Practice Final Exam AU10

# A survey of 15 randomly selected employees from bobs

• Notes
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12. A survey of 15 randomly selected employees from Bob’s factory was taken to find out how many sick days they took due to colds and flu last year. The boxplot is shown below. True or False : The boxplot says the number of people with more than 5 sick days is greater than the number of people with fewer than 5 sick days. a. True b. False Sick day 16 14 12 10 8 6 4 2 0 Boxplot of Sick day 13. The margin of error includes the amount of error you had in your data collection process. 8

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14. The correlation between calories and sodium content in hot dogs was strong and the scatterplot looked good. A computer found the regression equation is: Calories = 61.6 + 0.232 Sodium. A hot dog with 100 more milligrams of sodium is expected to have how many more calories? 15. A study finds that 70% of women always make sure they make an appointment for a yearly exam with their doctor. For men, the percentage is 40%. Is making an appointment for a yearly exam independent of gender? a. YES b. NO 16. What number is the 3 rd percentile of the Z distribution? 17. You know 30% of employees in your company have high sales records. Bob and Bill are chosen at random from your company. Suppose you find that Bill has a high sales record. What is the chance that Bob has a high sales record? a. .09 or 9% b. .60 or 60% c. .30 or 30% d. Not enough information to tell. 18. Suppose stat exam scores have a normal dist with mean 80 and SD 5. Bob got an 82 on the exam. That means Bob’s Z score is +2.0. 19. Bob wants a smaller margin of error for his new study. His choices are to have a smaller confidence level or to have a larger sample size. Which of these options is better from a statistical point of view? (Assume the cost of a larger sample is not an issue.) 20. You need to use the CLT every time you use a Z formula to calculate a probability for X . a. YES b. NO 9
21. Suppose sales at your company have a distribution with standard deviation \$1,000. You want to estimate the average sales for the company with a 95% confidence interval. Your interval comes out to be (\$243,232, \$253,429). You needed the Central Limit Theorem in order to calculate this confidence interval.

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• Winter '12
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