An Experiment Is Conducted with Two Groups of College Students

Short Answer

An experiment is conducted with two groups of college students. The 25 students in the treatment group scored an average of 3.7 with a standard deviation of 0.8. The 18 students in the placebo group scored an average of 3.3 with a standard deviation of 1.0. Compare the degrees of freedom from Welch's approximation with the conservative "by-hand" estimate for the degrees of freedom.