Correlation

Question 1

Correlation?

Answer 1

investigating the relationship between 2 continuous variables
(correlation doesn’t mean causation)

Question 2

scatter plots

Answer 2

each dot = 1 person
each person has a score on the x and y axis
correlation seen through pattern created

Question 3

Direction of correlation?

Answer 3

positive =when one variable increases so does the other

negative= when one increases other decreases

Question 4

Assumption of linearity

Answer 4

for non-linear relationships= correlation if not suitable for this data

Question 5

weak vs strong

Answer 5

strong correlation = closer to straight line
0= weak 1= strong
(0.01-0.29 =weak
0.30 - 0.69 =moderate
0.70-0.99) = strong
(-1 =strong negative)

Question 6

Degrees of freedom?

Answer 6

n-2

Question 7

Shared variance?

Answer 7

proportion of variance shared between 2 variables (rxr) = %
R^2
The percentage shows the difference in scores we find between one variable is dependent on the other variable
so, the rest of the % = other variables

Stronger correlation = higher shared variance
= more important the relationship is