# 2.01 Bivariate data and line of best fit

## Interactive practice questions

The following scatter plot shows the data for two variables, $x$x and $y$y.

Determine which of the following graphs contains the line of best fit.

A

B

C

D

A

B

C

D
Easy
Less than a minute

The following scatter plot graphs data for the number of people in a room and the room temperature collected by a researcher.

The following scatter plot graphs data for the number of copies of a particular book sold at various prices.

A least squares regression line is given by $y=3.59x+6.72$y=3.59x+6.72.

### Outcomes

#### ACMGM054

calculate and interpret the correlation coefficient (r) to quantify the strength of a linear association

#### ACMGM057

model a linear relationship by fitting a least-squares line to the data

#### ACMGM059

interpret the intercept and slope of the fitted line

#### ACMGM060

use the coefficient of determination to assess the strength of a linear association in terms of the explained variation