The results of a linear regression are shown below: y = ax + b
a = 10.33947066
b = 72.72151899
r 2 = 0.750253534
r = 0.8661717693
a) What is the correlation coefficient (round to the nearest tenth)?
b) What does the correlation coefficient tell us about the relationship between the
variables in the context of the problems. Be specific.

attachment?

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional