S1 regression line a and b

On the regression line you have a and b and in edexcel s1 they ask you what it represents
what do a and b in general represent on a regression line of
y=a+bx ?

Reply 1

gdunne42

Original post by N123456789

On the regression line you have a and b and in edexcel s1 they ask you what it represents
what do a and b in general represent on a regression line of
y=a+bx ?

It's an equation of a straight line, a is the y intercept and b is the gradient of the line.
So a is the value of y when x =0 and the gradient can be interpreted as an increase of X in the x value produces an in increase of Y. You need to explain the intercept and the gradient in the context of the variables investigated.

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