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 Based on results published in the Journal of Human Hypertension
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First, we need to organize the data in a clear way. The table seems to be mixed up. Let's rewrite it: Systolic: 115, 113, 123, 133, 119, 112, 118, 130, 116, 107 Diastolic: 83, 70, 91, 75, 88, 76, 88, 76, 70, 107 Show more…
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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. Systolic Diastolic 134 87 115 83 108 69 110 74 133 91 113 77 105 66 116 70 118 88 123 77 (b) Compute the correlation coefficient between systolic and diastolic blood pressure. Round your answer to at least 3 decimal places. The correlation coefficient is r= (c) If someone's diastolic pressure is above average, would you expect that person's systolic pressure to be above or below average? Explain.
Sri K.
Blood pressure is usually measured by wrapping a closed air-filled jacket equipped with a pressure gage around the upper arm of a person at the level of the heart. Using a mercury manometer and a stethoscope, the systolic pressure (the maximum pressure when the heart is pumping) and the diastolic pressure (the minimum pressure when the heart is resting are measured in mmHg. The systolic and diastolic pressures of a healthy person are about $120 \mathrm{mmHg}$ and $80 \mathrm{mmHg},$ respectively, and are indicated as $120 / 80 .$ Express both of these gage pressures in $\mathrm{kPa},$ psi, and meter water column.
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 eight adults. The following table presents the results. Systolic Diastolic 127 92 125 94 135 87 110 75 123 89 121 87 118 87 127 93 The least-squares regression equation is ŷ = 18.7841 + 0.5616x. If the systolic pressures of two patients differ by 8 mmHg, by how much would you predict their diastolic pressures to differ?
David N.
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