A sports psychologist develops a new technique that might improve school children's accuracy in shooting free throws. To test her technique, she arranges to give the new program to a girls' physical education class and the standard technique to the boys' physical education class. She finds that indeed the girls' accuracy in shooting improved more than the boys' accuracy. A colleague correctly points out Group of answer choices that as this was an experiment, the new technique caused the observed differences. that gender was an extraneous variable that was held constant. that the experiment is confounded by gender and is therefore inconclusive. that the results were actually caused by gender and not the technique.