Module 12: Correlation Flashcards
1
Q
What is a Scatterplot?
A
IV on x-axis
DV on y-axis
2
Q
What is a Positive Correlation?
A
When variable X increases,
variable Y increases
3
Q
What is a Negative Correlation?
A
When variable X increases,
variable Y decreases
4
Q
What do we use if we want to know what the relationship between two variables is?
A
- Correlation
- Linear Regression
5
Q
What if we want to predict one variable from another?
A
Linear Regression
6
Q
What are the 3 Designed Assumptions for Correlation?
A
- The 2 variables are measured at interval/ratio level
- Each case (or participant) is independent from the others
- Each case has one measurement for both variables
7
Q
What are the 4 Statistical Assumptions for Correlation?
A
- There is linear relationship between the two variables
- The dispersion is homogeneous (homoscedasticity)
- The two variables are normally distributed
- There are no extreme outliers
8
Q
Homoscedasticity
Example
A
9
Q
What is rho?
A
10
Q
What are the 3 Charcteristics of Correlation?
A
11
Q
What are the interpretations for the r value?
A
12
Q
What 3 pieces of information do we need to calculate Pearson correlation coefficient (r) ?
A
