Stats chapter 2 practice test
If one wanted to calculate summary statistics for salaries at a large company where there
are many people with modest salaries and a few with very high salaries, which would be the
most appropriate measures of center and spread?
a. median and IQR
b. Mean and IQR
c. Mode and Range
d. Mean and Standard Deviation - correct answer-a
Mr. Jones' class of 32 students had a mean score of 72.4% while Mr. Roberts' class of 29
students had a mean score of 63.4%. What is the mean score of these two classes?
a. 63%
b. 67.5%
c. 67.9%
d. 68.1
e. 72.4% - correct answer-d
After the times were calculated at a recent cross-country race, it was discovered that the
timers started their watches 3 minutes after the gun was shot for the start. If the mean time
for the runners was 21.2 minutes and the standard deviation was 2.1 minutes, what would
the new measurements be after adjusting the times?
a. cannot be determined without knowing how many runners there were
b. mean = 21.2, S = 5.1
c. mean = 24.2, S = 5.1
d. mean = 24.2, S = 2.1
e. mean = 21.2, S = 2.1 - correct answer-d
Given the five-number summary: What would the upper boundary be (to the nearest
hundredth)?
min 12 Q1 17.5 median 24 Q3 30 max 40 - correct answer-48.75
A set of data was submitted to a calculator and here are the summary statistics: Which is a
correct description of this data?
mean = 72.4
std dev = 2.8
median = 66.4
a. the data is symmetrical with no apparent outliers
b. The data is skewed left
c. The data is linear with a positive trend
d. The data is skewed right - correct answer-d
If one wanted to calculate summary statistics for salaries at a large company where there
are many people with modest salaries and a few with very high salaries, which would be the
most appropriate measures of center and spread?
a. median and IQR
b. Mean and IQR
c. Mode and Range
d. Mean and Standard Deviation - correct answer-a
Mr. Jones' class of 32 students had a mean score of 72.4% while Mr. Roberts' class of 29
students had a mean score of 63.4%. What is the mean score of these two classes?
a. 63%
b. 67.5%
c. 67.9%
d. 68.1
e. 72.4% - correct answer-d
After the times were calculated at a recent cross-country race, it was discovered that the
timers started their watches 3 minutes after the gun was shot for the start. If the mean time
for the runners was 21.2 minutes and the standard deviation was 2.1 minutes, what would
the new measurements be after adjusting the times?
a. cannot be determined without knowing how many runners there were
b. mean = 21.2, S = 5.1
c. mean = 24.2, S = 5.1
d. mean = 24.2, S = 2.1
e. mean = 21.2, S = 2.1 - correct answer-d
Given the five-number summary: What would the upper boundary be (to the nearest
hundredth)?
min 12 Q1 17.5 median 24 Q3 30 max 40 - correct answer-48.75
A set of data was submitted to a calculator and here are the summary statistics: Which is a
correct description of this data?
mean = 72.4
std dev = 2.8
median = 66.4
a. the data is symmetrical with no apparent outliers
b. The data is skewed left
c. The data is linear with a positive trend
d. The data is skewed right - correct answer-d
