A researcher has observed that children who eat more sugar tend to show a higher level of activity than children who eat less sugar.However,the researcher suspects that the apparent relationship may be explained by the fact that some children have a higher rate of metabolism which causes them to eat more and to be more active compared to children with a lower rate of metabolism who eat less and are less active.This is an example of

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The situation described here is the third-variable problem. This is because the researcher suspects that the relationship between sugar intake and activity level may be explained by a third variable, in this case, the rate of metabolism. It is possible that a child's metabolism influences both their sugar intake and activity level, which would mean that sugar intake and activity level are not directly related.

A Researcher Has Observed That Children Who Eat More Sugar