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March 2, 2010

Multiple choice Practice Quiz Unit 11

given:
x: 7 3 4 6
y: 11 9 6 1

what is the correlation coefficient? I am getting -3.6 but it is not an answer choice.

the answer choices given are:
-.68
-.41
-.04
+.41

Can someone please help me solve this if I am doing it wrong. I used formula 11.4

Posted by

Janelle V. at 9:30 AM CST

Comments (3)

Janelle Valle

says:

and again with a question on unit 11 practice test
x: 1 3 4 7 11
y: 3 6 2 8 9

i am getting a correlation coefficient of -1.92 but the answer choices are as follows:
.66
.89
.81
.55

Posted on Tue, 2 Mar 2010 9:47 AM CST by Janelle V.

Dr. Rebecca Guy

says:

Use the calculator labeled CORRELATION & REGRESSION.

In the column labeled X, enter 7, 3, 4, & 6 (each number should be on a separate line).

In the column labeled Y, enter 11, 9, 6 & 1 (again, one number per line).

Click CALCULATE.

You should see 'calculated r (df = 2) = -.042.

Hence, the correct answer is -.04.

Posted on Tue, 2 Mar 2010 4:31 PM CST by Rebecca G.