Question

1. The data below are ages and systolic blood pressures of 9 randomly selected adults.

Age 38 41 45 48 51 53 57 61 65

Pressure 116 120 123 131 142 145 148 150 152

Find the correlation coefficient r.

A. 1.488

B. 0.9210

C. 0.9597

D. 4.164

2. In an area of the Midwest, records were kept on the relationship between the rainfall (in inches)
and the yield of wheat (bushels per acre).

Rain (inches)	10.5	8.8	13.4	12.5	18.8	10.3	7.0	15.6	16.0
Yield (bushels/acre)	50.5	46.2	58.8	59.0	82.4	49.2	31.9	76.0	78.8

Find the correlation coefficient for the given data.

A.		4.267
B.		0.9808
C.		0.9620
D.		3.158

Answer 1

2)