**Cannabis users not so way out
**

This article looks at one of the "risk" areas which may be of interest to teachers of the health part of the curriculum. In fact it may be quite contentious because of the conclusions it draws. The last paragraph is of interest, however, because of the introduction of two measures of the middle of the data set of 268 people. The use of two different terms, "average" and "median", appears to indicate two different measures. It is important to discuss with students why the arithmetic mean is appropriate to describe the average age of the participants in the study.

- Is it likely that outlines would affect the value of the mean in a study such as this? (E.g.,what is the likely rang of ages involved?)
- Why also would the median be the approprate measure for the length of time of cannabis use?
- Why might it be expected that there would be greater variability or outlying values for the variable on cannibis use rather than for age? [It is possible, although of course not known , that the selection of participants for the study made certain that the age variable had a distribution well represented by the mean.]

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