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# A variability case study is examined.

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Shortly after their graduation, John and Mary bought two used vehicles. To satisfy their curiousity, they started to record their kilometrage each time they filled their gas tanks. After ten weeks, their records show the following numbers of kilometres per litre.

Mary: 17, 19, 16, 15, 18, 18, 20, 22, 15, 15
Mean= 17.5 Standard Deviation= 2.37

John: 9, 7, 16, 20, 23, 25, 29, 13, 15, 18
Mean= 17.5 Standard Deviation= 6.96

Interpret these results.

##### Solution Summary

A variability case study is examined.

##### Solution Preview

John and Mary both received the same average kilometrage - 17.5 Km/Litre - however, Johan had much more variability in his kilometrage than did Mary. (6.96 compared to sd of 2.37) Higher variability in this situation would indicate that something was seriously affecting John's kilimetrage - either to make ...

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