Correlation

Question 1

What type of plotting system do we use for corellation?

Answer 1

• A correlation will measure the strength and direction of the linear relationship between 2 variables
• Scatter plot that has X/ Y axis

Question 2

Scatter graph will always look like:

Answer 2

Linear but they would be outliers

Question 3

What are the values of correlation:

Answer 3

• Range between -1.00 and +1.00
• The closer the value of r –> the stronger relationship

Question 4

-1.00

Answer 4

• Negative/inverse correlation
• for every increase there is a decrease

Question 5

0.00

Answer 5

There is no relationship between variables

Question 6

+1.00

Answer 6

• Positive relationship

For every unit of increase there is a unit of increase in the other variable

Question 7

what does Σ mean?

Answer 7

It means sum

Question 8

Relationship status

Answer 8

+1.00 / -1.00 = perfect relationship

+0.70-0.99 / -0.70-0.99 = strong relationship

+0.40-0.69 / -0.40-0.69 = moderate relationship

+0.01-0.39 / -0.01-0.39 = weak relationship

0.00 = no relationship