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slope and intercept parameters

An estimate of the model:

Y= a + bX + u yielded the following values displayed in the table below

y x y estimate u estimate
0 1 -1 1
0 1 -2 2
1 1 0 1
2 3 3 -1
3 2 4 -1

y= Y-Ymean, x= X - Xmean;
a) compute an estimate of b
b) compute an estimate of var(u)

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Slope and intercept parameters are applied.

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