Chapter 1 of 5

The Data and the Question

Simple Linear Regression

Imagine 15 football players. Each dot is one player.

4681012Annual Salary (M€)010203040Market Value (M€)

Higher salary is related to higher market value.

4681012Annual Salary (M€)010203040Market Value (M€)

A regression line is a prediction machine. Plug in a salary, you'll get a market value.

4681012Annual Salary (M€)010203040Market Value (M€)

Slide the bar to plug in the annual salary.

y^=6.1+3.26×7.0\hat{y} = 6.1 + 3.26 \times 7.0
Predicted Market Value €0.0M

© 2026 Mohammad Iman