# Test Bank for Biostatistics for the Biological and Health Sciences, 2nd Edition

Preview Extract

Chapter 2 Exam A
Name
MULTIPLE CHOICE. Select the choice that best answers the problem.
Use the frequency distribution to answer the first four questions. A sample of 80 juvenile salmon is grouped into
the resulting frequency distribution based on their weights.
Weight (in grams)
100-149
150-199
200-249
250-299
Frequency
15
10
30
25
1) The distribution of the histogram for the weights of the juvenile salmon appears:
A) Normal
B) Skewed left C) Uniform
D) Skewed right
1)____________
2) If a relative frequency distribution were constructed for the weights of the salmon, what would
be the relative frequency for the class weighing 150-199 grams?
A) 12.5%
B) 31.25%
C) 18.75%
D) 37.5%
2)____________
3) If a cumulative frequency distribution were constructed for the weights of the salmon, what
would be the cumulative frequency for the class weighing less than 200 grams?
A) 15
B) 25
C) 55
D) 80
3)____________
4) If a pie chart were constructed for the weights of the salmon, what would be the measure of the
central angle for the class weighing 200-249 grams?
A) 67.5ยฐ
B) 112.5ยฐ
C) 45ยฐ
D) 135ยฐ
4)____________
Copyright ยฉ 2018 Pearson Education, Inc.
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5) Which choice displays the best graphic display of the amount of nitrous oxide (NO) explained
by the amount of carbon monoxide (CO) emissions in million metric tons over a ten year
period in the United States? The data set is below:
CO
5638
5708
5893
5807
5881
5939
6024
6032
5946
6022
NO
351
349
345
339
335
335
362
371
376
384
Emissions in the U.S. over Ten Years
6500
6000
5500
5000
1
3
5
7
9
Year
CO
CO Emission in Million
Metric Tons
B) Nitrous Oxide (NO) and Carbon Monoxide (CO)
Emissions in the U.S. over Ten Years
Emission in Million
Metric Tons
A) Nitrous Oxide (NO) and Carbon Monoxide (CO)
6100
6000
5900
5800
5700
5600
320
340
360
380
400
NO Emission in Million Metric Tons
NO
C) Nitrous Oxide (NO) and Carbon Monoxide (CO) D) Nitrous Oxide (NO) and Carbon Monoxide (CO)
Emissions in the U.S. over Ten Years
NO Emission in Million
Metric Tons
Emissions in the U.S. over Ten Years
400
380
360
340
320
5600
5800
6000
6200
CO Emission in Million Metric Tons
Copyright ยฉ 2018 Pearson Education, Inc.
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5)____________
6) A nurse measured the blood pressure of each person who visited her clinic. Following is a
relative-frequency histogram for the systolic blood pressure readings for those people aged
between 25 and 40 years. The blood pressure readings were given to the nearest whole number.
Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading
between 110 and 119 mm Hg inclusive?
6)____________
Systolic Blood Pressure for People Aged 25 โ 40 Years
A) 0.35%
B) 3.5%
C) 30%
D) 35%
7) A nurse measured the blood pressure of each person who visited her clinic. Following is a
relative-frequency histogram for the systolic blood pressure readings for those people aged
between 25 and 40 years. The blood pressure readings were given to the nearest whole number.
Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading
between 110 and 139 mm Hg inclusive?
Systolic Blood Pressure for People Aged 25 โ 40 Years
A) 75%
B) 89%
C) 59%
D) 39%
Copyright ยฉ 2018 Pearson Education, Inc.
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7)____________
8) A researcher records the number of new loggerhead turtle nests she locates each day. The data
are as follows.
8)____________
10 11 8 14 7 10 10 11 8 7
Which of these choices displays the correct dotplot?
9) The following data show the number of patients seen by a doctor in a day for twelve days.
46 65 55 43 51 48 57 30 43 49 32 56
Which of these choices displays the correct stemplot?
A)
B)
3
4
5
6
02
33689
1567
5
3
4
4
6
02
3689
13567
5
Copyright ยฉ 2018 Pearson Education, Inc.
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9)____________
10) The scatterplot below displays the amount of nitrous oxide (NO) explained by the amount of
carbon monoxide (CO) emissions in million metric tons over a ten year period in the United
States. Select the choice that best describes any relationship between the variables.
10)___________
NO Emission in Million Metric Tons
Nitrous Oxide (NO) and Carbon Monoxide (CO) Emissions
in the U.S. for Ten Years
390
380
370
360
350
340
330
5600
5650
5700
5750
5800
5850
5900
5950
6000
6050
6100
CO Emission in Million Metric Tons
A) There is a negative linear association between NO and CO.
B) There is a positive linear association between NO and CO.
C) Overall, there is no noticeable relationship between NO and CO.
D) NO can be explained by CO.
11) The following frequency distribution represents the age at which Alzheimerโs was first
diagnosed. Find the class midpoint for the interval 70-79.
Age
50-59
60-69
70-79
80-89
90-99
Number of Diagnoses
2
4
6
15
5
A) 75.0 years
B) 70.5 years
C) 74.5 years
D) 79.5 years
Copyright ยฉ 2018 Pearson Education, Inc.
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11)___________
12) The histogram below represents the number of digital thermometers per household for a
sample of U.S. households. What is the sample size?
12)___________
Number of Digital Thermometers Per U.S. Household
A) 100 households
C) 50 households
B) 5 households
D) 90 households
13) The weights (in pounds) of 22 members of the junior varsity football team are listed below.
13)___________
144 152 142 151 160 152 131 164 141 153 140
144 175 156 147 133 172 159 135 159 148 171
Which of these choices displays the correct stemplot?
A)
B)
13
14
15
16
17
135
0124478
1223699
04
125
13
14
15
16
17
135
1223699
0124478
04
125
14) The two key parts of a regression equation involve the ____________ and the
y-____________.
14)___________
A) slope; intercept
B) asymptote; intercept
C) slope; axis
D) asymptote; axis
15) Analysis of the data from 25 mothers indicates that an infantโs birth weight (g), y, can be
estimated by a motherโs weight (kg), x, using the regression equation y = 31x + 1501. For
every _______ kg increase in a motherโs weight, the infantโs birth weight increases by
_________ g.
A) 31; 1501
B) 1; 31
C) 31; 1
D) 1501; 31
Copyright ยฉ 2018 Pearson Education, Inc.
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15)___________
16) Analysis of the data from 25 mothers indicates that an infantโs birth weight (g), y, can be
estimated by a motherโs weight (kg), x, using the regression equation y = 31x + 1501. If a
motherโs weight is 70 kg, the infantโs birth weight can be estimated as _________ g.
A) 48,701
B) 1718
C) 46
D) 3671
17) Excessive drinking and the episodes of throat cancer have a high correlation, but it does not
prove _________.
A) correlation
B) causation
C) exponentiation D) a linear relationship
18) The frequency distribution below summarizes employee years of service for a regional
hospital. Determine the width of each class.
Years of
Service
1-5
6-10
11-15
16-20
21-25
26-30
A) 5 years
17)___________
18)___________
Frequency
5
20
25
10
5
3
B) 6 years
C) 4 years
D) 10 years
19) The frequency distribution below summarizes employee years of service for a regional
hospital. Determine the class boundary(ies) for the class 11 – 15.
Years of
Service
1-5
6-10
11-15
16-20
21-25
26-30
16)___________
19)___________
Frequency
5
20
25
10
5
3
A) 25 years
C) 10.5 and 15.5 years
B) 11 and 15 years
D) 10 and 16 years
20) A quality control manager wants to monitor the production of its pills to be sure that the mean
amount of medication does not change over time. Which of the following graphs is most
helpful for that purpose
A) Time-series graph
B) Pareto chart
C) Pie chart
D) Histogram
Copyright ยฉ 2018 Pearson Education, Inc.
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20)___________
Answer Key
Testname: CHAPTER 2 EXAM A
1) B
2) A
3) B
4) D
5) D
6) D
7) A
8) A
9) A
10) C
11) C
12) A
13) A
14) A
15) B
16) D
17) B
18) A
19) C
20) A
Copyright ยฉ 2018 Pearson Education, Inc.
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Chapter 2 Exam B
Name
MULTIPLE CHOICE. Select the choice that best answers the problem.
Use the frequency distribution to answer the next eight questions. A sample of 272 log jams found in river
channels in the Northwest U.S. is grouped into the resulting frequency distribution based on the width of the
channel in which the log jams were found.
Width of Channel
0-4m
5-9m
10-14m
15-19m
20-24m
25-29m
Frequency of Log Jams
103
82
49
16
16
6
1) The distribution of the histogram for the width of the channels appears ______________.
A) Normal
B) Skewed left
C) Uniform
D) Skewed right
1)____________
2) If a relative frequency distribution were constructed for the width of the channels, what would
be the relative frequency for the class with a width of 20-24m?
A) 5.9%
B) 18%
C) 2.2%
D) 30.1%
2)____________
3) If a cumulative frequency distribution were constructed for the width of the channels, what
would be the cumulative frequency for the class width less than 10m?
A) 103
B) 234
C) 185
D) 250
3)____________
4) If a pie chart were constructed for the width of the channels, what would be the measure of the
central angle for the class width 10-14m?
A) 21.2ยฐ
B) 136.3ยฐ
C) 108.5ยฐ
D) 64.9ยฐ
4)____________
5) The histogram below represents the number of digital thermometers per household for a sample
of U.S. households. What is the sample size?
5)____________
Number of Digital Thermometers Per U.S. Household
A) 5
B) 50
C) 90
D) 100
Copyright ยฉ 2018 Pearson Education, Inc.
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6) The following data consists of the weights (in pounds) of 15 randomly selected women and the
weights of 15 randomly selected men. Which of these choices displays the correct back-toback stemplot?
Women: 128
122
145
150
137
126
118
110
139
166
175
111
142
152
170
Men:
153
176
190
199
162
141
186
196
166
169
155
153
140
136
173
A)
B) Men
Men
Women
11 0 1 8
12 2 6 8
6 13 7 9
1 0 14 2 5
5 3 3 15 0 2
9 6 2 16 6
6 3 17 0 5
6 18
9 6 0 19
6
1 0
5 3 3
9 6 2
6 3
9 6
9 6
6)____________
Women
11 0 1
12 2 6 8
13 7 9
14 2 5
15 0 2 4
16 6
17 0 5
18
19
7) According to USA Today, the largest categories of sports equipment sales are as follows: fishing 7)____________
($2.0 billion); firearms and hunting ($3.1 billion); camping ($1.7 billion); and golf ($2.5
billion). What type of graph would depict these different categories and their relative amounts
the best?
A) A pie chart B) A bar chart C) A column chart D) A Pareto chart
8) The frequency distribution below summarizes the home sale prices in the city of Summerhill for
the month of June. Determine the width of each class.
Sale Price
(in thousand $)
80.0 – 110.9
111.0 – 141.9
142.0 โ 172.9
173.0 โ 203.9
204.0 โ 234.9
235.0 โ 265.9
A) 61
Frequency
2
5
7
10
3
1
B) 31
C) 28
D) 30
Copyright ยฉ 2018 Pearson Education, Inc.
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8)____________
9) A nurse measured the blood pressure of each person who visited her clinic. Following is a
relative-frequency histogram for the systolic blood pressure readings for those people aged
between 25 and 40 years. The blood pressure readings were given to the nearest whole number.
Approximately what percentage of the people aged 25 -40 had a systolic blood pressure
reading between 110 and 139 mm Hg inclusive?
9)____________
Systolic Blood Pressure for People Aged 25 โ 40 Years
A) 59%
B) 39%
C) 89%
D) 75%
10) The following frequency distribution d e p ic ts the scores on a math test. Find the class
midpoint of scores for the interval 95-99.
Scores
75-79
80-84
85-89
90-94
95-99
Number of Students
2
4
6
15
5
A) 97.5
B) 97.0
C) 96.5
D) 98.0
Copyright ยฉ 2018 Pearson Education, Inc.
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10)___________
11) A nurse measured the blood pressure of each person who visited her clinic. Following is a
relative-frequency histogram for the systolic blood pressure readings for those people aged
between 25 and 40 years. The blood pressure readings were given to the nearest whole number.
Approximately what percentage of the people aged 25 -40 had a systolic blood pressure
reading between 110 and 119 mm Hg inclusive?
11)___________
Systolic Blood Pressure for People Aged 25 โ 40 Years
A) 35%
B) 0.35%
C) 3.5%
D) 30%
12) The Kappa Iota Sigma Fraternity polled its members on the weekend party theme. The vote
was as follows: six for toga, four for hayride, eight for luau, and two for masquerade. Which
of these choices displays the correct Pareto chart?
Copyright ยฉ 2018 Pearson Education, Inc.
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12)___________
13) The following data show the number of patients seen by a doctor in a day for 12 days.
13)___________
46 65 55 43 51 48 57 30 43 49 32 56
Which of these choices displays the correct stemplot?
A)
B)
3
4
5
6
02
33689
1567
5
3
4
4
6
02
3689
13567
5
14) The following frequency distribution displays the scores on a math test. Find the class
boundaries of scores interval 40-59.
Scores
50-59
60-69
70-79
80-89
90-99
14)___________
Number of students
2
4
6
15
5
A) 49.5, 59.5
B) 50.5, 59.5
C) 49.5, 58.5
D) 50.5, 58.5
15) The following data represents the age at which a sample of patients had their first dental
implant.
38 39 37 37 44 38 41 38 39 35 42 39 43 37 41
Which of these choices displays the correct dotplot?
Copyright ยฉ 2018 Pearson Education, Inc.
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15)___________
16) A pharmaceutical company is always trying to create new flavors of childrenโs cough medicine.
They are market testing three kinds to find out which one has the best chance of being
consumed. They give small samples of each to 20 children at a pediatricianโs office. Four tasters
preferred the Strawberry Cream, 12 preferred Choco-Nuts, and four loved the Orange Mint.
Construct a Pareto chart to represent these preferences. Choose the vertical scale so that the
relative frequencies are represented.
Copyright ยฉ 2018 Pearson Education, Inc.
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16)___________
17) The frequency distribution below summarizes the home sale prices in the city of Summerhill
for the month of June. Determine the class midpoint (in thousand $) for the class 235.0 -265.9.
17)___________
Sale Price (in thousand $) Frequency
2
80.0 – 110.9
111.0 – 141.9
5
142.0 – 172.9
7
173.0 – 203.9
10
204.0 – 234.9
3
235.0 – 265.9
1
A) 250.4
B) 250.55
C) 250.45
D) 250.5
18) Identify the cumulative frequency distribution that corresponds to the given frequency
distribution.
Age at Death Frequency
0-29
4
30-59
16
60-89
60
90-119
20
A)
18)___________
B)
Age at Death
Cumulative
Frequency
Age at Death
Cumulative
Frequency
Less than 30
Less than 60
Less than 90
Less than 120
0.04
0.20
0.80
1.00
Less than 30
Less than 60
Less than 90
Less than 120
4
20
80
100
D)
C)
Age at Death
0-29
30-59
60-89
90-119
Cumulative
Frequency
Age at Death
Cumulative
Frequency
4
20
80
100
Less than 30
Less than 60
Less than 90
Less than 120
100
80
82
4
19) The linear __________ coefficient denoted by r measures the __________ of the linear
association between two variables.
A) correlation; strength
B) probability; likelihood
C) exponential; exponent
D) squares; weakness
19)___________
20) Smoking and the episodes of lung cancer have a high correlation, but it does not prove
_________.
A) causation
B) correlation
C) exponentiation D) a linear relationship
20)___________
Copyright ยฉ 2018 Pearson Education, Inc.
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Answer Key
Testname: CHAPTER 2 EXAM B
1) D
2) A
3) C
4) D
5) D
6) A
7) D
8) B
9) D
10) B
11) A
12) A
13) A
14) A
15) D
16) A
17) C
18) B
19) A
20) A
Copyright ยฉ 2018 Pearson Education, Inc.
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Chapter 2 Exam C
Name
SHORT ANSWER. Using the following information, write the word, phrase, or value that best answers the
problem.
1) A study of physical fitness tests for 12 randomly selected Pre-Medical students measured their
exercise capacity (in minutes). The following data resulted:
34
32
19
41
33
31
30
31
43
37
1)____________
36
18
Construct a stem and leaf plot of the students’ exercise capacity.
Use the frequency distribution to answer the next six questions. A sample of 80 juvenile salmon is grouped into the
resulting frequency distribution based on their weights.
Weight (in grams)
100-149
150-199
200-249
250-299
Frequency
15
10
30
25
2) Identify the class width, the class midpoints, and the class boundaries for the class 150 โ 199.
2)____________
3) Construct a corresponding histogram for the weights of the juvenile salmon.
3)____________
4) Describe the shape of the distribution of the histogram for the weights of the juvenile salmon.
4)____________
5) If a relative frequency distribution were constructed for the weights of the salmon, what would
5)____________
be the relative frequency for the class weighing 200-249 grams?
6) If a cumulative frequency distribution were constructed for the weights of the salmon, what
would be the cumulative frequency for the class weighing less than 250 grams?
6)____________
7) If a pie chart were constructed for the weights of the salmon, what would be the measure of the
central angle for the class weighing 150-199 grams?
7)____________
8) A bar chart and a Pareto chart both use bars to show frequencies of categories of categorical
data. What characteristic distinguishes a Pareto chart from a bar chart and how does that
characteristic help us in understanding the data?
8)____________
9) A medical school performed a study to find the main causes leading to its students
dropping out of school. Thirty cases were analyzed, and a primary cause was assigned to
each case. The causes included unexcused absences (U), illness (I), family problems (F), and
other causes (O). The results for the thirty cases are listed below:
9)____________
U U U I F O O U I F
F O U I I F I I O U
I
F F U U I I O F U
Construct a table summarizing the frequency distribution of the primary causes leading to
student dropout.
Copyright ยฉ 2018 Pearson Education, Inc.
28
10) Use the high closing values of Statstar Inc. stock from the years 2005 – 2016 to construct a
time-series graph. (Let x = 0 represent 2005 and so on.) Identify a trend.
Year
2005
2006
2007
2008
2009
2010
High
48
53
47
55
58
61
Year
2011
2012
2013
2014
2015
2016
10)___________
High
62
60
68
42
51
78
11) Describe at least two advantages to using stemplots rather than frequency distributions.
11)___________
12) The following data set represents the systolic blood pressure (in mm Hg) for 24 adults as
measured at their annual physical.
12)___________
105
110
125
105
110 98 102 115 110 123 118 101 95 128
122 107 118 107 117 125 116 110 101 107
Construct a frequency distribution with 4 classes, a class width of 2 hours, and a lower limit
of 100 for class 1.
13) The graph below shows the number of car accidents occurring in one city in each of the
years 2011 through 2016. The number of accidents dropped in 2013 after a new speed limit
was imposed. Does the graph distort the data? How would you redesign the graph to be less
misleading?
13)___________
Number of Car Accidents for 2011 โ 2016
14) Upon entering a medical exam, 26 patients were asked their ages. The results are shown
below. Construct a histogram to represent the data (with 5 classes beginning with a lower
class limit of 19.5 and a class width of 10). What is the approximate age at the center?
14)___________
43 56 28 63 67 66 52 48 37 51 40 60 62
66 45 21 35 49 32 53 61 53 69 31 48 59
15) Suppose that a data set has a minimum value of 24 and a maximum of 79 and that you
want 5 classes. Explain how to find the class width for this frequency table. What happens if
you mistakenly use a class width of 11 instead of 12?
Copyright ยฉ 2018 Pearson Education, Inc.
29
15)___________
16) Describe the differences between a histogram and a stemplot and discuss the advantages and
disadvantages of each.
16)___________
17) The frequency table below shows the amount of weight loss during the first month of a
diet program for a group of men. Construct a frequency polygon. Applying a loose
interpretation of the requirements for a normal distribution, do the pounds of weight loss
appear to be normally distributed? Why or why not?
17)___________
Weight (lb)
5-7
8-10
11-13
14-16
17-19
20-22
Frequency
2
9
18
13
4
1
18) Define the difference between a relative frequency distribution and a cumulative frequency
distribution.
18)___________
19) Graphs should be constructed in a way that is fair and objective. A common deceptive graph
alters the axes of the graph in what way?
19)___________
20) Describe how a data point labeled as an outlier can affect the analysis of a data set in a
frequency distribution or histogram.
20)___________
Copyright ยฉ 2018 Pearson Education, Inc.
30
Answer Key
Testname: CHAPTER 2 EXAM C
1)
1
2
3
4
8
9
0
1
1
3
1
2
3
4
6
7
2) class width = 50; midpoints = 124.5,174.5, 224.5, 274.5 class boundaries = 99.5,149.5,199.5, 249.5, 299.5
3) Notes: midpoints of classes were used; there should not be gaps between the bars.
4) Slightly skewed left.
5) 0.375
6) 55
7) 45
8) In a Pareto chart, the bars are arranged in descending order according to frequencies. The Pareto chart helps us
understand data by drawing attention to the categories which have the highest frequencies.
9)
Cause Frequency
U
9
I
9
F
7
O
5
10) Trend: Answers will vary. Possible answer: Except for a drop in high closing value in 2007, there was a
steady rise through 2013, after which there was a sharp drop in 2014 followed by increases through 2016.
High Closing Values of Statstar Inc.
Years Since 2005
Copyright ยฉ 2018 Pearson Education, Inc.
31
11) Answers will vary. Possible answer: The shape of a distribution can readily be seen. The plot can be drawn
quicker, since class width need not be calculated.
12)
Charges $ Frequency
100
2
110
12
120
5
130
5
13) The graph distorts the data because the vertical scale starts at 60 rather than 0, giving the impression of a
large difference in the number of accidents, when actually the number of accidents only varies from 90 to
120. To make the graph less misleading, change the vertical scale so that it begins at 0 and increases in
increments of 20.
14) The approximate age at the center is 50 years.
15) Since the range is 79 โ 24 = 55 , and 55 divided by 5 equals 11, a whole number, the class width has to be
widened from 11 to 12. If the class width was 11 data values equal to 79 would not be included in the
frequency distribution.
16) Answers will vary. A histogram organizes the data into classes that have widths determined by the designer.
Once a histogram has been created, the original data values can no longer be determined. An advantage is
that large amounts of data can be organized into a relatively small space. For stemplots, the groups are
determined by place value. The original data values are still accessible from stemplots. Stemplots can be
prohibitively large for large sets of data.
17) Amount of Weight Loss Among Males During First Month
18) A relative frequency distribution displays the proportion or percentage of the total. The sum of the percentages is
100%. Another variation of a frequency distribution is a cumulative frequency distribution in which the frequency
for each class is the sum of the frequencies for that class and all previous classes
19) A common deceptive graph involves using a vertical scale that starts at some value greater than zero to exaggerate
differences between groups.
20) An outlier is defined as a data point far away from the other data points. An outlier affects the calculation of the
mean of a data set and will pull the mean towards the outlier. In addition, an outlier will extend the range of the data
set, causing most of the bin intervals to be bunched together along with a large range of bins with no data until the
outlier bin is reached. This makes the analysis more difficult if the outlier is included making it more difficult to see
the behavior of the rest of the data points.
Copyright ยฉ 2018 Pearson Education, Inc.
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