Researchers wish to study fuel consumption rates based on speed. The data from 10 cars are below. It can be shown that for these data: = 41.9, = 17.8, = 2352.9, = 267.6, ( − ) = −270.2.
Calculate the sample correlation coefficient.
A) .12
B) −.12
C) −.36
D) −.34
E) .34

Question

Researchers wish to study fuel consumption rates based on speed. The data from 10 cars are below.  It can be shown that for these data:  = 41.9,  = 17.8,  = 2352.9,  = 267.6,  (  −  ) = −270.2.
Calculate the sample correlation coefficient.
A) .12 
B) −.12 
C) −.36 
D) −.34 
E) .34

Quizplus · Accepted Answer

r = s_xy/(s_x s_y) = −30.02/88.17 = −.34

Researchers Wish to Study Fuel Consumption Rates Based on Speed