Year 1 Chapter 4: Correlation

Question 1

What is bivariate data?

Answer 1

Data which has pairs of values for two variables.

Question 2

What is correlation?

Answer 2

The nature of the linear relationship between two variables.

Question 3

What is a regression line of y over x?

Answer 3

y = a + bx

Question 4

What is coefficient “b” in the regression line equation.

Answer 4

The change in y for each unit change in x.
(The gradient)

Question 5

What does it mean when the coefficient “b” is positive?

Answer 5

The data is positively correlated.

Question 6

What does it mean when the coefficient “b” is negative?

Answer 6

The data is negatively correlated.

Question 7

When should you use a regression line?

Answer 7

For making predictions for values of the dependent variable that are within the range of the data.