Math  /  Data & Statistics

QuestionBlood 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 T1-84 calculator to answer the following. \begin{tabular}{cccc} \hline Systolic & Diastolic & Systolic & Diastolic \\ \hline 112 & 75 & 157 & 103 \\ 107 & 71 & 154 & 94 \\ 110 & 74 & 134 & 87 \\ 108 & 69 & 115 & 83 \\ 105 & 66 & 113 & 77 \\ \hline \end{tabular}
Based on results published in the Journal of Human Hypertension Send data to Excel
Part: 0/40 / 4
Part 1 of 4
Compute the least-squares regression line for predicting the diastolic pressure from the systolic pressure. Round the slope and yy-intercept to at least four decimal places.
Regression line equation: y^=0.7157x6.8931\hat{y}=0.7157 x-6.8931
Part: 1/41 / 4
Part 2 of 4
Is it possible to interpret the yy-intercept? Explain. \square No , the xx-values are all \square negative . \square \square

Studdy Solution
Regression line equation: y^=0.7157x6.8931\hat{y} = 0.7157x - 6.8931. No, the y-intercept cannot be interpreted because a systolic pressure of zero is not realistic.

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