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?

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