Measures of Variability

Find the IQR (Q3 - Q1) of the data

20, 22, 25, 29, 31

• 30

• 25

• 21

• 9

Calculate the interquartile range of the following data: 17, 18, 18, 19, 20, 21, 21, 23, 25

• 3

• 8

• 4

• 5

What is the IQR of this data set?

37, 42, 48, 51, 52, 53, 54, 54, 55

• 5

• 6

• 8

• 9

What is the Q₃ for the following data? 52, 72, 96, 21, 58, 40, 75

• 58

• 75

• 40

• 35

Quartile 1 is the...

• Median

• Mode

• Upper Quartile

• Lower Quartile

IQR stands for...

• interquestion rainbow

• inside quick radiation

• interquartile range

• I quit running

What is the interquartile range (IQR)?

• 4

• 64

• 60

• 8

What is the range?

• 10

• 12

• 15

• 2 - 12

The interquartile range (IQR) of a data set is the difference between the third and first quartiles. It represents the range of the middle half of the data.

• True

• False

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.