An experiment in teaching research methods in psychology was recently conducted at a large university. One section was taught by the traditional lecture-lab method, a second was taught by an...

An experiment in teaching research methods in psychology was recently conducted at a large university. One section was taught by the traditional lecture-lab method, a second was taught by an all-lab/demonstration approach with no lectures, and a third was taught entirely by a series of videotaped lectures and demonstrations that the students were free to view at any time and as often as they wished. Students were randomly assigned to each of the three sections, and, at the end of the semester, random samples of final exam scores were collected from each section. Test whether teaching method affected student performance on the final exam. Use the .05 significance level.

What is the correct decision and conclusion?