IQR and MAD

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

• Find the Mean of the data

• Find the Absolute Values of the data

• Subtract each data value from the mean

• Find the Mean of your Absolute value set

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

• Find the mean of the data

• Find the Mean of the Absolute Value set

• Subtract each data value from the mean, creating a new set of numbers

• Find the Absolute Values

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

• Find the Mean of the data

• Find the Absolute Values of the data

• Find the mean of your new set of numbers

• Subtract each data value from the Mean.

First step to finding the IQR

• Place the numbers in order and find the median

• Look for the middle number of the first half of the data Q1, and the number of second half Q3

• Subtract your Q3 - Q1

• Subtract the biggest and smallest number

Second step to finding the IQR

• Place the numbers in order and find the median

• Look for the middle number of the first half of the data Q1, and the number of second half Q3

• Subtract your Q3 - Q1

• Subtract the biggest and smallest number

Third step to finding the IQR

• Place the numbers in order and find the median

• Look for the middle number of the first half of the data Q1, and the number of second half Q3

• Subtract your Q3 - Q1

• Subtract the biggest and smallest number

Find the median of following test grades:
100   80   70   90   100

• 88
• 100
• 30
• 90

Find the MEAN for following test grades:

100 80 70 90 100

• 88

• 90

• 50

• 10.4

Find the MAD for following test grades:
100   80   70   90   100

• 30
• 52
• 15
• 10.4

Find the IQR of following test grades:
100   80   70   90   100

• 30
• 20
• 25
• 15