1. Blood pressure measurements consists of two numbers, the systolic pressure an
ID: 2948405 • Letter: 1
Question
1. Blood pressure measurements consists of two numbers, the systolic pressure and the diastolic pressure. Subjects taking an experimental blood pressure medicine had the following measurements:
Systolic
134
115
113
123
119
118
Diastolic
76
83
77
77
69
75
Compute the correlation coefficient. Round to 3 decimal places
2. An automotive engineer computed a least-squares regression line for predicting the gas mileage (y) in miles per gallon of a certain vehicle from its speed (x) in miles per hour. The result is y=-0.13x+34.52. Predict the gas mileage when the vehicle is travelling at 65 miles per hour. Round to one decimal
Systolic
134
115
113
123
119
118
Diastolic
76
83
77
77
69
75
Explanation / Answer
1. The statistical software output for this problem is:
Correlation between Systolic and Diastolic is:
-0.17946065
Hence,
Sample correlation coefficient = -0.179
2. Gas mileage when the vehicle is travelling at 65 miles per hour:
y = -0.13*65 + 34.52
y = 26.1
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