Describe Measures of Spread

Which measure of spread should be used to describe the distribution?

• standard deviation

• interquartile range

• range

• median

Find the IQR of the distribution.

(only type in the number)

(a)  

Find the interquartile range?

• 8

• 6

• 5

• 4

The IQR is the

• max - min

• Interquartile Range

• measure of spread that pairs with the mean

• Q₃ - Q₁

Which distribution has a larger Interquartile Range?

(a)  

Which distribution has the smallest IQR? What is the value of the IQR?

• C, IQR= 20

• B, IQR= 5

• A, IQR= 6

The distribution shown is symmetric and we should use the mean and the standard deviation to describe the center and spread.

• True

• False

Because this distribution is ____________ to the ___________, we would use the ______________ for the center and the _____________ for the spread of the data.

• symmetric, middle, median, IQR

• skewed, left, median, IQR

• skewed, left, mean, IQR

• skewed, right, median, standard deviation

__________ are used to describe the distribution, or spread, of the data.

• third quartile

• median

• measures of variation

• quartiles

This is used to describe the distribution of the data

• outlier

• range

• measures of variation

• quartile