A study of the effect of exposure to color ( red or blue) on the ability to solve puzzles used 40 subjects. Half the subjects 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 20 subjects in the red-colored environment had a mean time for solving the puzzles of 9.65 seconds with standard deviation 3.41; the 20 subjects in the blue-colored environment had a mean time of 15.83 seconds with standard deviation 8.64. The two-sample t statistic for comparing the population means has value (± 0.001).