Research has shown a positive correlation between the amount of time children spend watching television and their levels of aggression.It is possible that the actual cause of this relationship involves harsh parents who act aggressively toward children (teaching them to be aggressive)and whose violence leads children to avoid them at all costs (including by watching television).This example illustrates the issue of

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The example given in the question suggests that there may be a third variable, which is the harsh parenting style, that is causing both the increased television watching and aggression in children. This exemplifies the issue of the third variable.

Research Has Shown a Positive Correlation Between the Amount of Time