4 Correlation Flashcards
1
Q
What is bivariate data?
A
Data which has pairs of values for two variables
2
Q
What is a least squares regression line?
A
A line of best fit that minimises the sum of the squares of the distance of each data point from the line
3
Q
How is the regression line of y on x written?
A
y=a+bx
Where the coefficient b tells you the gradient
4
Q
Interpolation
A
Using the regression line to make a prediction of a value inside the range of given data
5
Q
Extrapolation
A
Using a regression line to predict a value outside the given data (not reliable)
6
Q
Causal relationship
A
When a change in one variable causes a change in the other
