Year 1 Chapter 4: Correlation Flashcards
1
Q
What is bivariate data?
A
Data which has pairs of values for two variables.
2
Q
What is correlation?
A
The nature of the linear relationship between two variables.
3
Q
What is a regression line of y over x?
A
y = a + bx
4
Q
What is coefficient “b” in the regression line equation.
A
The change in y for each unit change in x.
(The gradient)
5
Q
What does it mean when the coefficient “b” is positive?
A
The data is positively correlated.
6
Q
What does it mean when the coefficient “b” is negative?
A
The data is negatively correlated.
7
Q
When should you use a regression line?
A
For making predictions for values of the dependent variable that are within the range of the data.
