Question

Hi I've got a scatterplot intio which I've entered the relevant data.

I've then been given a linear model with the following equation;

N = 0.892T + 10.7

How do I use the linear equation above to find information from the scatterplot? is there a standard formula I should be using?

Any help much appreciated,
TVM

Answer 1

what you need to do is graph the line in the scatter plot....

N - intercept 10.7 (vertical axis), gradient = 0.892

you need to see if the line describes the data...

1. is the data evenly spread on both sides of the line...

2. is the data tightly grouped.

3. does the data have a similar gradient to the given line.

A lot of this is just observation.... but you would need to make specific comment....

Answer 2

Its all tightly packed around the line, what i'm being asked to do is use the linear model to estimate a number (in this case households that will have broadband in a set year). I can obviously do this from the scatter plot and this gives me an answer but i'm also supposed to use algebra to estimate the same information (if that makes sense)?

Answer 3

well if the line fits the data, then are you being asked

given T find N...?

if so substitute T into your linear regression equation and get a value of N

Answer 4

ok cheers think i've got it

Answer 5

and the value of N is only a forecast or estimate

Answer 6

ok thanks alot for your help