Correlations

Question 1

What does correlation refer to?

Answer 1

How closely two (or more) variables are related

Question 2

What is the correlation efficient r=+1?

Answer 2

A perfect positive correlation

Question 3

What is the correlation efficient r=-1?

Answer 3

A perfect negative correlation (when one goes up, the other goes down by the same amount)

Question 4

What is the correlation efficient r=0?

Answer 4

No correlation at all

Question 5

What are used to illustrate correlation coefficients?

Answer 5

Scattergrams

Question 6

What’s the difference between a correlation and an experiment?

Answer 6

An experiment involves the manipulation of a variable to find how it affects other variables. Correlations just analyse the relationship between 2 variables.

Question 7

Why can correlational studies be less time consuming?

Answer 7

Secondary data can be used

Question 8

What is the main limitation of correlational studies?

Answer 8

It is difficult to establish a cause and effect relationship, only an association is found