Standard Deviation and Interquartile Range

Calculate the interquartile range of the following data17, 18, 18, 19, 20, 21, 21, 23, 25

• 3

• 4

• 5

• 8

What is the interquartile range (IQR)?

• 4

• 64

• 60

• 8

If we use the mean to measure the typical value or center of the data, we would use the _________ to measure the variability.

• IQR

• Median

• Mean

• Standard Deviation

If we use the median to measure the typical value or center of the data, we would use the _________ to measure the variability.

• Mode

• MAD

• Standard Deviation

• IQR or Interquartile Range

A dataset has a low of 15, a high of 75, a median of 45, and a first quartile of 30. What is the interquartile range of the dataset?

• 15

• 30

• 45

• 60

A box and whisker plot shows the minimum grade as 65, the maximum grade as 95, the median grade as 80, and the first and third quartiles as 70 and 90, respectively. What is the interquartile range of the grades?

• 15

• 20

• 25

• 30

The two measures of center we've study this unit are...

• Interquartile Range

• Mean Absolute Deviation

• Mean

• Median

• Standard Deviation

Interquartile Range or IQR is a measure of variability and helps determine the spread of the data.

• True

• False

A typical value is found by using either the...

• MAD

• Mean

• Standard Deviation

• Median

Which of the following is a measure of spread, or variability? (select all that apply)

• Interquartile Range

• Standard Deviation

• Mean

• Median

• Range