Question

The table shows the battery lives in hours of ten Brand A batteries and ten Brand B batteries.

Which would be the best measures of variability to use to compare the data?

Answer 1

THE RIGHT ANSWER IS D; Both distributions are skewed left, so the interquartile range is the best measure to compare variability.

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Answer 2

Plotting the data (attached photo) roughly shows that the data is skewed to the left. In other words, data is skewed negatively and that the long tail will be on the negative side of the peak.

In such a scenario, interquartile range is normally the best measure to compare variations of data.

Therefore, the last option is the best for the data provided.