SOLUTION: What is the correlation coefficient with the following data points: (2,49), (45,2), (5,6)? A.) 0.62 B.) -0.62 C.) 0.52 D.) -0.52

Algebra ->  Probability-and-statistics -> SOLUTION: What is the correlation coefficient with the following data points: (2,49), (45,2), (5,6)? A.) 0.62 B.) -0.62 C.) 0.52 D.) -0.52       Log On


   

Question 1083757: What is the correlation coefficient with the following data points: (2,49), (45,2), (5,6)?
A.) 0.62
B.) -0.62
C.) 0.52
D.) -0.52
Found 2 solutions by MathLover1, Edwin McCravy:
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
(2,49), (45,2), (5,6)


after you calculate that above, you get
r+=-2637+%2F4285.02
r+=+-0.6153996947505496...round it to two decimal places
r+=+-0.62
so, answer is B.) -0.62

Answer by Edwin McCravy(20059) About Me  (Show Source):
You can put this solution on YOUR website!

If you have a TI-83 or 84,

Turn diagnostics on:

Press 2nd
Press 0  (zero)
Press x-1
Scroll down to DiagnosticOn
Press ENTER twice

[You won't have to do the above ever again.]

Press STAT
Press ENTER

Make the screen read like this:

L1     |L2    |L3      
 2     |49    |------
 45    |2     |
 5     |6     |
 ------|------|  

Press STAT
Press the right arrow to highlight CALC
Press 4
Press ENTER five times

Read this

y=ax+b
a=-.6680161943
b=30.57694737
r2=.378772069
r=-.615446108

That last number, r, is the correlation coefficient. 

Edwin