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
123	77
119	69
118	88
130	76
116	70
133	91
112	75
107	71
110	74
108	69

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(a) Construct a scatterplot of the diastolic blood pressure

y

versus the systolic blood pressure

x

.

Diastolic

y 65 70 75 80 85 90 95 100 105 110 115 120 x 105 110 115 120 125 130 135 140 145 150 155 160 165 100

Systolic

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(b) Compute the correlation coefficient between systolic and diastolic blood pressure. Round the answer to at least three decimal places.

The correlation coefficient is =r

.

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(c) If someone's diastolic pressure is above average, would you expect that person's systolic pressure to be above or belowaverage? Explain.

I would expect the person's systolic pressure to be (Choose one) average since

r

is (Choose one).