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a) Which of the following could be the value of r? -0.546, 2.371, -0.856, 0.1273, 0.9388 b) Given the regression line has a slope of

a) Which of the following could be the value of r? -0.546, 2.371, -0.856, 0.1273, 0.9388 b) Given the regression line has a slope of 21.6 and a y-intercept of -115.50, find the slope-intercept equation of the regression line. c) Use the regression line to predict the y-value (sales) for the x-value(temperature)of 21.

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