Question

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A college professor surveys his students to find out if they prefer short answer or multiple-choice tests. The professor then reports to the president of the college:
“Three out of four students prefer multiple-choice tests.”
Explain why this statistic is misleading.

Answer 1

The professor surveyed his students only. The professor didn't survey any other class to get a better representative sample.

Answer 2

So the professor has a good idea of what his class wants, but not what the whole school wants.