The equation of a line of best fit (Edexcel GCSE Statistics): Flashcards
📚Flashcards
Practise the cards
9 cards from this deck
ShowHide
Practise the cards
9 cards from this deck
What is the format of a line of best fit equation?
What is the format of a line of best fit equation?
Y = ax + b, where a = gradient, b = y-intercept.
How do you find the gradient between two points?
How do you find the gradient between two points?
Gradient = (change in y) / (change in x).
What does a positive gradient indicate?
What does a positive gradient indicate?
An increasing trend; y increases as x increases.
How to determine the y-intercept from the line?
How to determine the y-intercept from the line?
Read where the line crosses the y-axis (x=0).
When calculating gradient, which points should you choose?
When calculating gradient, which points should you choose?
Choose two clear, distinct points on the line.
How do you find the y-intercept if it's not on the graph?
How do you find the y-intercept if it's not on the graph?
Use point and gradient: b = y - ax for a known point.
What does the gradient tell us in real-world context?
What does the gradient tell us in real-world context?
The rate of change between variables.
What is another name for the line of best fit?
What is another name for the line of best fit?
Trend line or regression line.
Why is it important to interpret the gradient in context?
Why is it important to interpret the gradient in context?
It shows the real-world rate of change.