Quiz 1 FA04 KEY - a. 23% b. 42 c. 55 d. 78 * e. 80%...

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Name SSN ECON 2843 Fall 2004 Quiz 1 Students must show all work on problems that involve calculation, even if the question is multiple choice. Questions 1 through 4 refer to the following: A consumer group conducted a study regarding the number of hours of TV that teenagers watched per week. The results of the sample were as follows. Hours per week frequency 0 – 3 8 3 – 6 9 6 – 9 17 9 – 12 21 12 – 15 23 15 – 18 20 1. What is the mean "weekly hours of TV watched" for the sample? a. .551 b. 9 c. 9.371 d. 10.6224 * e. 173.5 2. What is the standard deviation of the weekly hours of TV watched? a. 4.6 * b. 18 c. 20.9 d. 21.1 e. 2051 1
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3. If one of the sample observations is selected randomly, what is the probability that the teenager will watch less hours of TV than the median class ? a. 17% b. 35% * c. 44% d. 56% e. 65% 4. What is the cumulative frequency of the class 12 – 15 ?
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Unformatted text preview: a. 23% b. 42 c. 55 d. 78 * e. 80% Questions 5 10 refer to the following. An office manager wrote down the number of cups of coffee that each employee in the office drank at work in one month. The results for this population are as follows: 30 , 12 , 0 , 15 , 26 , 40 5. Using the correct symbol, calculate the variance. a. 13.06 b. 14.31 c. 170.6 * d. 204.7 e. 400 6. What is the interquartile range? a. 3.5 b. 18 * c. 21.5 d. 36 e. 40.5 7. Calculate the coefficient of variation. a. 2% b. .6 c. .7 d. 63.71% * e. 69.8% 2 8. What is the range? a. 3.5 b. 18 c. 19 d. 40 * e. 52 9. What is the median? a. .25 b. 2 c. 20.5 * d. 26 e. 30 10. Does this distribution appear to be symmetric, skewed left, or skewed right? symmetric 3...
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Quiz 1 FA04 KEY - a. 23% b. 42 c. 55 d. 78 * e. 80%...

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