Blood pressure: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 10 adults. The following table presents the results. Use a TI-84 calculator to answer the following.

Systolic	Diastolic	Systolic	Diastolic
115	83	130	76
113	77	116	70
123	77	133	91
119	69	112	75
118	88	107	71

Part 1 of 4

Compute the least-squares regression line for predicting the diastolic pressure from the systolic pressure. Round the slope and y-intercept to at least four decimal places.

Regression line equation: =y

part 2of 4

Is it possible to interpret the y-intercept? Explain. yes or no x-values are all positive or negative?

part 3 0f 4

If the systolic pressures of two patients differ by 20 millimeters, by how much would you predict their diastolic pressures to differ? Round the answer to three decimal places.

part 4 of 4

Predict the diastolic pressure for a patient whose systolic pressure is 128 millimeters. Round the answer to one decimal place.