The three groups above are from the study "The Impact of various test prep programs on test scores". Consider the equation for the F statistic - actually, yesterday's entire lecture- and then reason out for me which groups, if any, are statistically different (reject H,). Again, | am not asking you for computations- indeed that isn't possible with the data you're given-rather I'm asking you to apply some of the concepts we learned yesterday in class to give me a statistically sound reason which groups are different and why you think so. Feel free to employ the concept of z-scores to support your reasoning