Scatter Diagrams

Question 1

What are the different types of correlation?

Answer 1

No correlation, Weak Positive Correlation, Strong Negative Correlation, Linear Positive Correlation, and Quadratic Correlation

Question 2

What are scatter diagrams useful for?

Answer 2

to visualize patterns in data

Question 3

What do you use correlation coefficient for?

Answer 3

to calculate if the correlation is significant

Question 4

Why does correlation not mean causation (because of a link to something else)?

Answer 4

trend could be caused by another factor

e.g. a increase in sales in a ice cream van on a beach is not because of shark attacks but because of weather or a different factor

Question 5

What do you write on the x axis?

Answer 5

independent variable

is controlled by investigator, and causes change in dependent variable

Question 6

What do you write on the y axis?

Answer 6

dependent variable

depends on or affected by the independent variable