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8. A researcher conducts a study to determine whether there is a linear relationship between a person's height (in inches) and pulse rate (in beats per minute). The data are shown in the table below Heights, x 67 71 66 59 73 75 79 64 68 Pulse rate, y 89 90 89 99 100 101 104 65 87 , 2 y xy 89 71 90 66 89 69 99 73 100 75 101 79 104 64 65 87 Ex= (a) Find the correlation coefficient (r). (b) Find the regression equation. (c) Plot this regression line equation on the same graph as the scatterplot