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1. We’ve seen that r 2 1.Show that equality holds if all the observed values of Y actually lie on…

1. We’ve seen that r 2 1.Show that equality holds if all the observed values of Y actually lie on…

1. We've seen that r2 1.Show that equality holds if all the observed values of Y actually lie on the line  = a +bX.2. Think of a test-retest situation. Let X and Y be the scores on the first and second tests, respectively. You might expect to have σx = σy. Assume that's true. Explain why, as a group, persons who score far above average on the first test will, on average, score less on the second test. What about low scorers?