GCSE Secondary Maths Age 13-17 - Probability & Statistics: Line of Best Fit - Explained

The video tutorial explains how to interpret a graph showing the relationship between average temperature and gas usage. It guides viewers through completing a scatter graph, describing the correlation, and estimating temperature using a line of best fit. The tutorial emphasizes understanding graph scales and axes, plotting points, and interpreting data trends.

What is the first step you should take before answering any question about a graph?

• Calculate the average temperature.

• Plot all the points on the graph.

• Look at the scale and axes of the graph.

• Read the question carefully.

How do you describe the relationship between average temperature and gas usage?

• Negative correlation

• Constant correlation

• No correlation

• Positive correlation

What happens to gas usage as the average temperature increases?

• Gas usage decreases.

• Gas usage fluctuates randomly.

• Gas usage remains constant.

• Gas usage increases.

What is the purpose of drawing a line of best fit on a scatter graph?

• To make the graph look more complete.

• To highlight the highest and lowest points.

• To estimate values not directly measured.

• To connect all the data points.

If you estimate the average temperature when 12 units of gas are used, what should you do to ensure full marks?

• Guess the value based on intuition.

• Use a calculator for accuracy.

• Show the use of the graph in your answer.

• Provide a detailed explanation.