Are the +/- values the distribution of the data rather than the margin of error. So on average the cookie group was still better. Also I wonder if someone coul

Are the +/- values the distribution of the data rather than the margin of error. So on average the cookie group was still better. Also I wonder if someone could draw the same conclusion that the environment being taught in (i.e. has cookies) is an important factor along with the actual material being taught.