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Comparing Data Sets Answers

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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.
2
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The histogram shows the prices for six-packs of adult socks and six-packs of kid socks at a store. What is true about the variability of the prices of socks in kid sizes or adult sizes?

Question illustration
A
There is more variability in the prices of kid socks because they have a greater range.
B
There is more variability in the prices of kid socks because the median is lower.
C
There is more variability in the prices of adult socks because there are two bars of equal height.
D
There is more variability in the prices of adult socks because the median is greater.
3

The table shows the battery lives, in hours, of ten Brand A batteries and ten Brand B batteries. Which would be the best measure of variability to use to compare the data?

Question illustration
A
Only Brand A data is symmetric, so standard deviation is the best measure to compare variability.
B
Only Brand B data is symmetric, so the median is the best measure to compare variability.
C
Both distributions are symmetric, so the mean is the best measure to compare variability.
D
Both distributions are skewed left, so the interquartile range is the best measure to compare variability.
4

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.
5

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
6

The histogram represents the distributions of boiling temperatures, in degrees Celsius, of tap water and a mixture of salt water.

Question illustration
A
The two distributions are each nearly symmetric.
B
The distributions do not overlap on the same range of temperatures.
C
The distribution of salt water boiling temperatures is left-skewed.
D
The distribution of tap water boiling temperatures is right-skewed.
7

The box plots represent the distributions of typing speeds of students before and after a computer-programming course. Which statement is true about the variability of the distributions?

Question illustration
A
The interquartile range of the typing speeds after the course is greater than the interquartile range of the speeds before the course.
B
The interquartile ranges of the two distributions are the same.
C
The range of the speeds after the course is smaller than the range of the speeds before the course.
D
The ranges of the two distributions are the same.
8

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.
9

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
10

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

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