A school district is comparing two methods for teaching math to third-graders. A class of n=20 students is being taught by Method A, and another class of n=20 students is being taught by Method B. At the end of the school year, all of the students take a standardized math achievement test. The scores for the students taught by Method A produced a mean of 75 with a sum of squares of 1800, and the students taught by Method B have a mean of 87 with a sum of squares of 2000. Do the two methods differ in their effectiveness at teaching math? = .01.