Mean Absolute Deviation

What is the third step when calculating the Mean Absolute Deviation?

• Find the distance each value is from the mean

• Find the mean of the distances

• Find the mean of the data

Find the Mean Absolute Deviation:  5, 11, 2, 7, 16.  The Mean is 8.2 

• 3.2

• 2.8

• 1.2

• 4.2

Which mean absolute deviation would have a greater variability or spread?  4.2 or 8.5?

• 4.2

• 8.5

Which mean absolute deviation would be more consistent? 4.2 or 8.5?

• 4.2

• 8.5

True or false? :The larger the Mean Absolute Deviation the more consistent the data is.

• True

• False

In calculating MAD, after you find the absolute deviations you must _____________.

• Do nothing because you are done.

• Subtract them from the mean.

• Find the mean of the absolute deviations.

True or false?: You subtract the mean from each data value to find the absolute deviation.

• True

• False

Which of the following is the mean absolute deviation for the set of data?
2.50 3.75 1.25 2.25 3.00

• 3.3

• 0.66

• 2.50

• 2.55

Find the MAD of the following data sets: $29, $58, $15, $129, $75, $22

• 196

• 54.7

• 114

• 32.67

Find the MAD for the following set: 65, 90, 85, 70, 70, 95, 55

• 12.24

• 75.7

• 85.7

• 40