Correlation & Regression

What is a scatter plot?

• A graph that shows the relationship of two data sets

• A graph that shows information that is connected in some ways

• A graph drawn using rectangular bars to show how large each value is

• A graph that shows data changing over time

A scatter diagram may reveal

• the strength of a relationship.

• the direction of a relationship.

• the form of a relationship.

• all of the above.

Which scatter plot shows no relationship?

• Graph A
• Graph B
• Graph C
• Graph D

State the independent variable (x) and dependent variable (y) for the case below:

The monthly rents of apartments (RM) and the size of the apartments (square feet)

• x = monthly rents of apartments , y = size of the apartments

• x = size of the apartments , y = monthly rents of apartments

State the independent variable (x) and dependent variable (y) for the case below:

Daily calorie consumption and body weight (kg)

• x = Daily calorie consumption, y = body weight

• x = body weight, y = Daily calorie consumption

What would be the correlation between Mathematics grade and the time it takes to run a mile?

• Positive correlation

• No correlation

• Negative correlation

• Cannot be determined

When the values of two variables move in the same direction, correlation is said to be

• Linear

• Non-linear

• Positive

• Negative

The value of the coefficient of correlation r lies between:

• 0 and 1

• -1 and 0

• -1 and +1

• -0.5 and +0.5

. ________measures the strength of the linear relationship between the dependent and the independent variable.

• Correlation Coeeficient

• Distance value

• Y Intercept

• Residual

State the correlation between number of days absent from school and mathematics marks

• Positive Correlation

• Negative Correlation

• No Correlation