Correlations

Question 1

what is correlation?

Answer 1

the measure of the extent to which two variables are related

Question 2

What is a positive correlation?

Answer 2

relationship between the two variables move in the same direction
e.g. as one variable increases so will the other

Question 3

What is a negative correlation?

Answer 3

relationship between to variables in which an increase in one results with a decrease in the other

Question 4

What graph is used to express correlations?

Answer 4

scattergrams

Question 5

What does the correlation coefficient (r) indicate?

Answer 5

the extent to which the pairs of numbers for the two variables lie on a straight line, values over 0 indicate a positive correlation while those under 0 indicate a negative correlation

Question 6

What is a perfect negative correlation?

Answer 6

-1

Question 7

What is a perfect positive correlation?

Answer 7

1

Question 8

Why does correlation not equal causation?

Answer 8

a correlation only shows the relationship between variables which means there could be a third variable that’s involved

Question 9

What is the difference between an experiment and a correlation?

Answer 9

an experiment tests the effect that an independent variable has upon a dependent variable but a correlation looks for a relationship between two variables