Measures of Center and Variation

When finding the median what is the FIRST step?

• Mark off the lowest number

• Mark off the highest number

• Find the Middle

• Arrange the number from Least to Greatest

Find the mean of these numbers:

2, 57, 38, 42, 6

• 29

• 38

• 50

• 145

What is the first 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

What is the second 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

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: 10, 9, 3, 8, 10. The Mean is 8

• 3

• 5

• 1

• 2

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

• 4.2

• 8.5

Which dot plot shows more consistency? a or b?

• a

• b

How do you find the Interquartile Range?

• divide the 3rd quartile by the 1st quartile

• subtract the biggest number by the smallest number

• divide the biggest number by the smallest number

• subtract the 3rd quartile by the 1st quartile

What is the outlier in this data set?

• 35

• 21

• 30

• 60