A blood pressure measurement consists of two numbers: the systolic pressure, which is the maximum pressure taken when the heart is contracting, and the diastolic pressure, which is the minimum pressure taken at the beginning of the heartbeat. Blood pressures were measured, in millimeters of mercury (mmHg), for a sample of 16 adults. The following table presents the results.

a. Compute the least-squares regression line for predicting the diastolic pressure from the systolic pressure.

b. Is it possible to interpret the y-intercept? Explain.

c. If the systolic pressures of two patients differ by 10 mmHg, by how much would you predict their diastolic pressures to differ?

d. Predict the diastolic pressure for a patient whose systolic pressure is 125 mmHg.

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Systolic Diastolic Systolic Diastolic 134 87 133 91 115 83 112 75 113 77 107 71 123 77 110 74 119 69 108 69 118 88 105 66 130 116 70 76 157 103 70 154 94