Scatter Graphs

Question 1

How do you find out the gradient of a line

Answer 1

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

Question 2

What is it called when a line of best fit is straight

Answer 2

A linear model

Question 3

What formula could you use if the lobf isn’t straight

Answer 3

Y = a/x 
Y = a (squared by x) 
Y = ax squared

Question 4

How do you work out x bar and y bar

Answer 4

Add all the numbers on the axis up and divide by how many there are