The boxplots below display the distribution of maximum speed by type of roller coaster for a data set of 145 roller coasters in the United States.
-For steel roller coasters, if the outlier at 120 was removed, the sample mean would
A) increase.
B) decrease.
C) stay the same.
D) There is not enough information given to know if the sample mean would change.

Question

The boxplots below display the distribution of maximum speed by type of roller coaster for a data set of 145 roller coasters in the United States. 
-For steel roller coasters, if the outlier at 120 was removed, the sample mean would
A) increase. 
B) decrease. 
C) stay the same. 
D) There is not enough information given to know if the sample mean would change.

Quizplus · Accepted Answer

Removing an outlier that is higher than the rest of the data points will decrease the sample mean.

The Boxplots Below Display the Distribution of Maximum Speed by Type