Math 1530-017 Exam 1 With Answer Key - 2009 Page 4
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11Use the following boxplots to answer the next three questions. Here are the boxplots of
the number of calories in 20 brands of beef hotdogs, 17 brands of meat hot dogs, and 17 brands of
poultry hot dogs.
11. The main advantage of boxplots over stemplots and histograms is
(a) boxplots show more detail about the shape of the distribution.
(b) boxplots use the five-number summary, whereas stemplots and histograms use the mean and
standard deviation.
(c) boxplots show skewed distributions, whereas stemplots and histograms show only symmetric
distributions.
(d) boxplots show symmetric distributions, whereas stemplots and histograms show only skewed
distributions.
(e) boxplots make it easy to compare several distributions, as in this example.
12. This plot shows that
(a) All poultry hot dogs have fewer calories than the median for beef and meat hot dogs.
(b) most poultry hot dog brands have fewer calories than most beef and meat hot dogs, but a few
poultry hot dogs have more calories than the median beef and meat hot dog.
(c) about half of poultry hot dog brands have fewer calories than the median for beef and meat hot
dogs.
(d) hot dog type is not helpful in predicting calories, because some hot dogs of each type are high
and some of each type are low.
(e) the mean number of calories for poultry hotdogs is 130.
13. We see from the plot that the median number of calories of a beef hot dog is about:
(a) 153.
(b) 190.
(c) 179.
(d) 139.
(e) 129.
14. Here are the IQ test scores of 10 randomly chosen fifth-grade students:
96
110
118
118
122
125
126
130
139
145
The five-number summary of these IQ scores is
(a) 96, 114, 125, 134.5, 145
(b) 96, 118, 122.9, 130, 145
(c) 96, 118, 123.5, 130, 145
(d) 96, 118, 123.5, 130, 145
(e) 96, 118, 125, 130, 145
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