Homework Answers
A) Given data
Lower outlier decreases the mean
Total number of observations =18=n
Now calculate the mean value including outlier(14)
Mean =sum of the data/n
(50+51+69+57+88+88+77+82+98+66+70+65+53+62+14+72+64+68) /18
Mean =1194/66.33
Now calculate the mean value excluding outlier (14)
Mean =(1194-14)/17
=1180/17=69.41
The outlier is 1. The outlier in the data set causes the mean to decrease from 69.41 to about 66.33.
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