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36 (Requires computing.) a Generate 500 data sets, each with 30 pairs of observations (x;, y;). Use a bivariate normal distribution with means 0, standard deviations 1, and correlation 0.5 to generate each pair (x;, y;). For each data set, calculate y and yreg, using xy = 0. Graph a histogram of the 500 values of y and another histogram of the 500 values of yreg. What do you see? b Repeat part (a) for 500 data sets, each with 60 pairs of observations