Pearson's r

Computing Pearson's r

Questions

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.

Callback before_footer in local_aigrade component should be migrated to new hook callback for core\hook\output\before_footer_html_generation

line 7225 of /lib/moodlelib.php: call to debugging()
line 7292 of /lib/moodlelib.php: call to {closure}()
line 71 of /lib/classes/hook/output/before_footer_html_generation.php: call to get_plugins_with_function()
line 987 of /lib/classes/output/core_renderer.php: call to core\hook\output\before_footer_html_generation->process_legacy_callbacks()
line 97 of /mod/book/tool/print/index.php: call to core\output\core_renderer->footer()