Best Measure of Spread

Which describes the shape of the distribution?

• skewed right, and the best measure of spread is range

• skewed left, and the best measure of spread is range.

• skewed right, and the best measure of spread is interquartile range.

• skewed left, and the best measure of spread is interquartile range.

Find the IQR of the distribution.

(only type in the number)

(a)  

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

• standard deviation

• interquartile range

• range

• median

Find the interquartile range?

• 8

• 6

• 5

• 4

Which set of numbers below has the greatest spread (variation)? The numbers are already in order.

​ (a)   ​ ​ ​ ​ ​

• 0, 1, 3, 6, 11, 12

• 2, 3, 3, 3, 5

• 4, 6, 6, 8, 8

• 3, 5, 7, 9, 11

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

• MAD

• interquartile range

• range

• median

The IQR is the

• max - min

• Interquartile Range

• measure of spread that pairs with the mean

• Q₃ - Q₁

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

• C, IQR= 20

• B, IQR= 5

• A, IQR= 6

The range is the difference between the maximum and minimum values.

• True

• False

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

• True

• False