were asked to solve a series of puzzles while in a red-colored environment. The

Question

were asked to solve a series of puzzles while in a red-colored environment. The other half were asked to solve the same series of puzzles while in a blue-colored environment. The time taken to solve the puzzles was recorded for each subject. To compare the mean times for the two groups of subjects using the two-sample t procedures with the conservative Option 2, the correct degrees of freedom is ·(21.22) A study of the effect of exposure to color (red or blue) on the ability to solve puzzles used 42 subjects. Half the subjects (21) eBook 20. 0 41 40

Explanation / Answer

The degrees of freedom ae given by (n1+n2-2) thus in this case it is (21+21-2) which is 40, so correct answer is C

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