Lesson 1 of 4
What a data graph is showing you
Explanation
A graph turns a table of numbers into a picture. In this example, each dot is one car. The bottom axis shows its weight and the side axis shows its fuel efficiency. When the dots have a general direction, a model can learn that trend. Here the dots slope down: heavier cars usually get fewer miles per gallon. This is called a negative relationship.
Visual explanation
Read this from left to right: what goes in, what happens, and what comes out.
The dots lean downward: as car weight grows, fuel efficiency usually falls.
In plain language
A regression problem predicts a number, such as fuel use or house price. Each dot is one real example.
Remember
Regression predicts a number, not a category.
What to do
Look at the graph. If a car becomes heavier, does its fuel efficiency usually go up or down?