Measure Center and Variability

It's the middle number in a set of data.

• mean

• median

• mode

• range

It's the number that occurs the most times in a set of data.

• mean

• median

• mode

• range

Which measure of center should you use if there is an outlier in your data?

• mean

• median

What is the median of the following set of data?

• 25

• 23

• 14

• 21

What is the mode of the following set of data?

14, 21, 23, 25, 25

• 23

• 21

• 14

• 25

Is there an outlier in the following set of data?

8, 45, 45, 47, 48, 48, 49, 50

• yes

• no

It is a measure of variability that you get when you subtract the smallest number in a set of data from the largest number.

• mean

• median

• mode

• range

Which measure of center should you use if there are no outliers?

• mean

• median

Which class has the higher test score median? 

• Class #1

• Class # 2 

• The medians are equal

• The median is not shown here. 

The double line plot shows the number of students who attended the home games of the baseball team for two recent seasons.  Which of the following statements is NOT true.

• The median attendance for 2009 was less than the median attendance than 2010.

• The attendance for 2010 was more consistent, so the MAD would be smaller than the MAD for 2009.

• The attendance for 2009 was more consistent, so the MAD would be smaller than the MAD for 2010.

• The attendance for 2010 ranged from 20-27.