Suggested answer to exercise: Locomotor milestones and babywalkers, 1

Question 1: Baby walker use was reported to start at a median age of 26 weeks, (interquartile range 26-28). What does this tell us about the distribution of age of first use?

Suggested answer

The first and second quartile are both 26, so at least 25% of observations were exactly 26 weeks (i.e. exactly six months). The data were recorded in whole weeks. The distribution is likely to be positively skew, as the median is right at the lower end of the IQR.

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Last updated: 23 October, 2006.

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