Line of best fit (AQA GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
What is the purpose of a line of best fit?
What is the purpose of a line of best fit?
It shows trends and helps predict unknown values.
How do you draw a line of best fit accurately?
How do you draw a line of best fit accurately?
Draw a straight line that balances points above and below.
What should the line of best fit pass through?
What should the line of best fit pass through?
It should pass through the mean point (x̄, ȳ).
Why extend the line of best fit beyond data points?
Why extend the line of best fit beyond data points?
To cover the full range of data for better predictions.
What does a positive correlation indicate?
What does a positive correlation indicate?
Both variables increase together; line slopes upward.
How to calculate mean x-coordinate from data?
How to calculate mean x-coordinate from data?
Use: x̄ = Σfx / Σf.
How to predict values using the line of best fit?
How to predict values using the line of best fit?
Find x, draw up to the line, read the corresponding y.
What is a common mistake when drawing the line?
What is a common mistake when drawing the line?
Forcing the line through (0,0) when not needed.
What does a negative correlation indicate?
What does a negative correlation indicate?
One variable increases while the other decreases.
What is the first step in drawing a line of best fit?
What is the first step in drawing a line of best fit?
Plot all data points carefully on the scatter diagram.