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A new reality TV show is testing contestants on how long it takes to solve four different types of puzzles. Because it is thought that males and females tend to solve puzzles differently, contestants were randomly divided into groups by gender. Each subject solved all $4\text{ puzzles}$, in a randomized order.

Which statement concerning this experimental design is true?

A

This is a matched pairs design.

B

Gender is a blocking factor.

C

Gender and puzzle type are confounding variables.

D

There are eight treatment combinations in this experiment.

E

Puzzle type is a blocking factor.

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