Unformatted text preview: d is 29. 9. A) B) C) D) E) Which of the following statements is FALSE?
The distribution of a categorical variable lists the categories and gives the counts or the percent of individuals in each category.
A bar chart is a useful graphical tool for describing the shape of the distribution of a categorical variable. A stemplot is particularly valuable for displaying the shape of the distribution of a categorical variable when there are few observations.
A histogram shows the distribution of counts or percents among the values of a single quantitative variable. Bar graphs, unlike histograms, have blank spaces between the bars to separate the items being compared. 10 In the fuel efficiency study of 2007 compact model automobiles the following histogram of the distribution of the miles per gallon fuel efficiency rating in city driving (MPG‐City) for automobiles manufactured in Europe was obtained: A) B) C) D) E) From the histogram above, showing the distribution of MPG‐City, we can see that the shape of the distribution is roughly symmetric with one peak.
the distribution is skewed to the left.
the distribution is skewed to the right.
the distribution is roughly symmetric with outlier values to the left.
the shape of the distribution would be easier to see if a stemplot had been constructed instead of the histogram. 3 J Diaco Elements of Statistics I Supplemental Final Exam Review 11 The ages of the 667 people participating in a large workshop (to the nearest year) are summarized as follows: Age 18 19
25 32 Number of students 14 120 200 200
2 1 What is true about the median age? A) It could be any number between 19 and 20. B) It must be 20. C) It must be 21. D) It must be over 21. 12 A reporter wishes to portray baseball players as overpaid. Which measure of center should he report as the average salary of major league players? A) The mean. B) The median. C) Either the mean or median. They will be equal in this case. D) Neither the mean nor the median. Both will be much lower than the actual average salary. Use the following information to answer questions 13‐17. The Insurance Institute for Highway Safety publishes data on the total damage suffered by compact automobiles in a series of controlled, low‐speed collisions. The cost for a sample of 9 cars, in hundreds of dollars, is provided below. 10 6 8 10 4 3.5 7.5 8 9 13 What is the median cost of the total damage suffered for this sample of cars? A) $400 C)
B) $730 D)
$1000 14 What is the first quartile for the above data?
A) $350 C)
B) $500 D)
$800 15 What is the interquartile range of the above data?
A) $300 C)
B) $350 D)
$450 16 What is the mean of the total damage suffered for this sample of cars?
A) $239 B) $733 C) $800 D) $950 17 Using the correct units, what is the value of the variance?
A) 224.85 dollars B) 238.48 dollars2
C) 50,555.54 dollars2
D) 56,875 dollars2 Use the following information to answer questions 18‐19. The Michigan Department of Transportation (M‐DOT) is working on a major project: 80% of the highways in Michigan need to be repaved. To speed completion of this project, many contractors will be working for M‐DOT. Contractors are currently bidding on the next part of the project. To help make a decision about which contractor to hire, M‐DOT collects many vari...
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- Summer '09
- Statistics, J Diaco, Supplemental Final Exam