The following data set shows the ages (X) and blood pressures (Y) of 12 subjects:
X: 56 42 72 36 63 47 55 49 38 42 68 60
Y: 147 125 160 118 149 128 150 145 115 140 152 155
a) Plot the data in a scatterplot.
b) Compute the sample covariance and the sample correlation coefficient.
c) Find the equation for the regression line of Y on X (best fit line for Y vs X).
d) Estimate the blood pressure of a subject whose age is 45 years.