Scatter Graphs Flashcards
1
Q
How do you find out the gradient of a line
A
You pick two points that lie on your line and call one of them (X1 and Y1) and the other (X2 and Y2) then find the differences between the y’s over the difference between the x’s.
Y2 - Y1 / X2 - X2
2
Q
What is it called when a line of best fit is straight
A
A linear model
3
Q
What formula could you use if the lobf isn’t straight
A
Y = a/x Y = a (squared by x) Y = ax squared
4
Q
How do you work out x bar and y bar
A
Add all the numbers on the axis up and divide by how many there are
