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Five members of the football team and five members of the track team ran the 100-meter dash. Their times are listed in the table below:



Football Track

12.1 12.2

13.7 11.2

12.1 11.3

11.7 12.1

14.5 13.2



What is the difference of the means for the two groups?

Verified Answer :

zhduch

Mean (average) of the football team:
(12.1+13.7+12.1+11.7+14.5)/5 = 12.82 

Mean (average) of the track team:
(12.2+11.2+11.3+12.1+13.2)/5 = 12

Subtract: 12.82-12 = 0.82 s

So the difference of the means for the two groups is 0.82 seconds.

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