Correlation

Question 1

What is correlation?

Answer 1

Finds the best fit line by minimising the distances between the data and the line

Describes single relationship, its strength and direction

X and Y are interchangeable

Question 2

What does the R value tell you?

Answer 2

1) Which direction your correlation is
2) How strong your correlation is

Question 3

What does the r-squared value tell you?

Answer 3

How much the variance is explained by your correlation

Question 4

If the R2 value is to 1, what does this tell you?

Answer 4

There is a lot of variance

Question 5

What does 1-r2 represent?

Answer 5

The amount of variance unexplained

Question 6

Does correlation allow prediction?

Answer 6

No

Question 7

What can cause problems in regression and correlation?

Answer 7

Non-Linear Relationships

Question 8

Who first suggested the mathematical approach for determining the magnitude of a
linear relationship between two variables, such as X and Y?

Answer 8

Karl Pearson