Pearson's r

Question 1 out of 4.

What is the correlation between the two variables $\mathrm{X}$ and $\mathrm{Y}$ listed below? (We suggest you use a stat program or Analysis Lab).

_________

X Y

8 10

10 9

10 11

11 11

12 8

12 10

15 14

5 8

11 11

9 9

11 12

10 13

7 12

8 7

6 9

15 12

9 10

10 11

9 11

7 5

8 7

8 10

8 6

6 9

10 9

Question 2 out of 4.

What deviation score on $\mathrm{X}$ corresponds to the raw score of $\mathrm{6}$?

_________

X Y

2 4

4 3

6 5

Question 3 out of 4.

What is the sum of $\mathrm{xy}$?

_________

X Y

2 4

4 3

6 5

Question 4 out of 4.

What is the effect on the correlation of adding $\mathrm{12}$ to every score on one variable?

1. The correlation may go up or down, it depends on the data.
2. The correlation will increase.
3. The correlation will not change.