The indelible memories of the 9/11 terrorist tragedy unduly inflated many people's estimates of the risks associated with air travel. this best illustrates the importance

The availability heuristic.

Explanation:

The availability heuristic is a mental tendecy to name a specific item, object, date, memory, etc, that comes to mind when thinking of a specific event, memory, object, etc. In this case, 9-11 best explains this mental shortcut given that, the first things that comes to mind when thinking of air travel tragedies or terrorist attacks, is that unfortunate incident.

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answer; when one group has an extremely high score at pretest;