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Comparing Data Sets Answers

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The table shows the daily time, in minutes, Maggie spent at swim practice and band practice over the last ten days. Which statement is true about the measures of center of the practice times?

Question illustration
A
Maggie’s daily time at band practice tends to be greater than her time at swim practice.
B
Maggie’s daily time at band practice has less variation than her daily time at swim practice.
C
Maggie’s daily time at swim practice tends to be greater than her time at band practice.
D
Maggie’s daily time at swim practice tends to have more variation than her daily time at band practice.
2
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A research study was conducted to measure the time students focus on a task before being distracted. The box plots show the distributions of attention spans of high school and college students.Which statements are true regarding the data sets? Select two options.

Question illustration
A
The median attention span of college students is greater than the median attention span of high school students.
B
The range of attention span of college students is greater than the range of attention spans of high school students.
C
The interquartile range of attention spans of college students is greater than the interquartile range of attention spans of high school students.
D
All of the college students in the study had greater attention spans than the high school students.
E
The minimum attention span of high school students is greater than the minimum attention span of college students.
3

The box plots show the data distributions for the number of customers who used a coupon each hour during a two-day sale. Which measure of variability can be compared using the box plots?

Question illustration
A
interquartile range
B
standard deviation
C
mean
D
median
4

Two histograms showing the number of pets owned by boys and girls in a science class are each skewed left. Which measure of variability should be used to describe the data?

A
mean
B
median
C
standard deviation
D
interquartile range
5

The table shows the test scores of students who studied for a test as a group (Group A) and students who studied individually (Group B).

Question illustration
A
The scores of Group B are skewed right, so the mean and range are the best measures for comparison.
B
Both distributions are nearly symmetric, so the mean and the standard deviation are the best measures for comparison.
C
Both distributions are nearly symmetric, so the median and the interquartile range are the best measures for comparison.
D
The scores of both groups are skewed, so the median and standard deviation are the best measures for comparison.
6

The histogram shows the distributions of prices for packs of adult socks and packs of kid socks at a store. Which measure of center is the best to use to compare the prices of kid socks and adult socks?

Question illustration
A
range
B
mean
C
median
D
standard deviation
7

The box plots show the distributions of the numbers of words per line in an essay printed in two different fonts. Which measure of center would be best to compare the data sets?

Question illustration
A
The median is the best measure because both distributions are left-skewed.
B
The mean is the best measure because both distributions are left-skewed.
C
The median is the best measure because both distributions are symmetric.
D
The mean is the best measure because both distributions are symmetric.
8

The box plots show the data distributions for the number of laps two students run around a track each day.

Question illustration
A
The difference between the medians of both data sets is 2.
B
The difference between the medians of both data sets is 4.
C
The difference between the ranges of both data sets is 2.
D
The difference between the ranges of both data sets is 4.
9

The box plots represent the ages of pennies in two 50-cent rolls.

Question illustration
A
She is correct because the medians are 10 years apart, which means the means are half of that, or 5 years apart.
B
She is correct because the maximum ages of the pennies in each set are 5 years apart.
C
She is not correct because the means are both equal to 12.
D
She may not be correct because means cannot be determined from the box plots.
10

The table shows the growth, in centimeters, of plants in two different soils after two weeks. Which statement explains which soil tended to have a greater growth?

Question illustration
A
Soil A had greater growth because its data have a greater standard deviation.
B
Soil A had greater growth because its data have a greater mean.
C
Soil B had greater growth because its data have a greater interquartile range.
D
Soil B had greater growth because its data have a greater median.

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