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STAT2004Exam1-Solns

# STAT2004Exam1-Solns - when there are 25 cops in the park a...

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You have 50 minutes to complete this exam. For each question, choose the most correct response. You are allowed a calculator and both sides of a standard 8.5”x11” crib sheet. This exam is closed- book and closed-notes. A student is interested in studying the ages his professors finally earned tenure. He sampled six professors and got the following information: age: 3 5 4 1 5 0 3 9 4 2 40 1. What is the average age for making tenure?

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2. What age is the 30 th percentile? 3. What age is the mode? 4. = 10291 ) ( 2 i x What is the standard deviation? a) 4.956 b) 24.567 c) 20.472 d) 4.525
A study was done to see whether the number of police in a park on a given day affected the number of muggings. The following data were obtained: police: 2 5 ? 8 1 0 13 muggings: 1 2 1 1 9 5 ? 2 77 0 . 90 5 . 73 7 5 . 7 - = = = = = XY YY XX SS SS SS y x 5. What is 2 x s ? 6. What is b ?

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7. What is r ? 8. True or False? It would be extrapolation to use this equation to predict the number of muggings

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Unformatted text preview: when there are 25 cops in the park. a) True b) False 9. Which of the following is true about standardized values? a) s = 1 b) 1 = z c) s = 0 d) 1 < < z 10. Which of the following is not a resistant statistic? a) mean b) median c) mode d) IQR 11. True or False? The sample median will always be a number that was observed in the data set. a) True b) False 12. True or False? The following distribution is skewed right. 33 mode 32 ~ 28 = = = x x a) True b) False 13. What is the IQR? 41 24 20 15 10 4 3 2 1 = = = = = Q Q Q Q Q a) 21 b) 9 c) 4 d) 26 14. True or False? If r is positive, then a in our regression equation must also be positive. a) True b) False 15. True or False? b from the regression equation will always be between -1 and +1 ) 1 1 ( ≤ ≤-b . a) True b) False 16. What is the standardized value for 10? 582 . 2 , 667 . 6 , 11 ~ , 667 . 11 2 = = = = s s x x a) .646 b)-.646 c)-.387 d) .250...
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STAT2004Exam1-Solns - when there are 25 cops in the park a...

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