Correlation Week 7

Question 1

What are the essential features of Pearson’s Correlation?

Answer 1

Correlations measure the STRENGTH and DIRECTION of LINEAR RELATIONSHIPS between two continuous/scale variables

Question 2

What variables does correlation measure?

Answer 2

Two continuous/scale variables

Question 3

What is linearity?

Answer 3

How straight the lines are

Question 4

What is meant by strength?

Answer 4

The size of magnitude

Question 5

What is meant by direction?

Answer 5

Which way the line is pointing, either positive or negative

Question 6

What correlations are considered large?

Answer 6

Those at .80 and below/above

Question 7

What correlations are considered moderate?

Answer 7

Those at .50 and below

Question 8

What corrections are considered weak?

Answer 8

.30 and below

Question 9

What must r be between?

Answer 9

-1 and +1

Question 10

Explain R square.

Answer 10

R square tells you the overlapped/shared variance. For example, if you are looking at the relationship between years of school and occupation prestige, an R square of .34 means that 34% of the results for occupation prestige can be explained by years of school.

Question 11

What does r equal if there is no correlation?

Answer 11

0

Question 12

What is the most important/only thing that r measures?

Answer 12

‘The straight line’ - linearity

Question 13

What is a typical correlational statistical question?

Answer 13

Is there a statistically significant relationship between…

Question 14

What is a positive correlation?

Answer 14

As one variable increases, so does the other

Question 15

What is a negative correlation?

Answer 15

As one variable increases, the other DECREASES

Question 16

What type of correlation is most commonly used?

Answer 16

Pearson’s product-moment correlation

Question 17

What is a continuous variable?

Answer 17

Can take on any value and indicate magnitude; e.g age 10 is twice as old as 5