Outlier Lesson

Outliers: Watch the following video, then continue on with the lessson.

https://youtu.be/9aDHbRb4Bf8

​Effect of Outliers:

• Outliers skew the mean

• If the outlier is high, it makes the mean higher, low it makes the mean lower.

• Median is a better representation in the presence of outliers

​Numbers OUTSIDE the fence are OUTLIERS

Multiple Choice

What measure of center is most greatly effected by outliers?

• Mean

• Median

• Mode

• Range

Multiple Choice

What measure of spread is most greatly effected by outliers?

• Median

• Mean Absolute Deviation

• Range

• Interquartile Range

Multiple Choice

In the data set: 1,2,3,4,2,3,6,15

The number 15 is an outlier. What would happen to the mean if you removed the outlier.

• It would stay the same

• It would increase

• It would decrease

• IDK

Multiple Choice

In the following data set:

200,250,276,300,400,325

Identify the outlier(s)

• There are no outliers

• The outlier is 400

• The outlier is 200

• The outliers are 200 and 400.

Multiple Choice

Which measurement would change the most if you remove an outlier from a data set?

• Mean

• Median

• IQR

• Mode

Multiple Choice

In the following data set identify the outlier:

1,2,3,4,5,2,3,4,5,9,12

• There is no outlier

• The outlier is 9

• The outlier is 12

• There are two outliers, 9 and 12.