Brainlag PlusPlotting, lines of best fit, gradient and intercept, proportional or linear, the area under a graph and tangents to curves.
Plotting and best fit
Independent variable across (x), dependent variable up (y).
Choose scales that use more than half the grid and go up in 1, 2 or 5 per square. Plot with small neat crosses.
A line of best fit (straight or a smooth curve) goes through the middle of the points with roughly as many above as below. Ignore an anomaly: do not draw the line through it.
Use a bar chart when the independent variable is a category (materials, colours), a line graph when it is a number.
The rest of this lesson and its 10 practice questions are in Plus.
Screen 1 of 4, free to read.
- 10 exam-style questions, marked as you go, each with a worked solution
- The Graph Plotter beside every question
- Anything you get wrong is saved to your flashcards