You are Here: Home >< Maths

# Very hard stats question...need urgent help!! watch

1. Hi so I was wondering if anyone could help me with this stats (s1) question on regression.

It goes...
In a regression calculation for five pairs of observations, one pair of values were lost. The regression line of y=2x - 0.1

The other four pairs of values are

x: 0.1 0.2 0.4 0.3
y: 0.1 0.3 0.7 0.4

Find the pissing pairs of values, using the following date for the four pairs above:

Sigma x = 1
Sigma x^2 = 0.3
Sigma xy = 0.47
Sigma y = 1.5

I've started doing it, but I've got myself stuck into a crazy algebraic equation which i doubt will give me the right answer.

2. Anyone?
3. to find the missing pair (p,q) you can start by using the fact that the point (xbar, ybar) must fit the regression line exactly.

xbar is (1+p) /5
ybar is (1.5 +q)/5

then you write out the formulas for the gradient and intercept of the regression line and substitute in 2p for q.
this leads to a quadratic equation in p which you can solve...

the bear

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: December 10, 2010
Today on TSR

### Edexcel GCSE Maths Unofficial Markscheme

Find out how you've done here

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams