Use the data set GPA1 for this exercise.(i) Use OLS to estimate a model relating colGPA to hsGPA, ACT, skipped, and PC. Obtain the OLS residuals.(ii) Compute the special case of the White test for heteroskedasticity. In the regression of u^2i on colGPAi, colGPA2i, obtain the fitted values, say h^i.(iii) Verify that the fitted values from part (ii) are all strictly positive. Then, obtain the weighted least squares estimates using weights 1/h^i. Compare the weighted least squares estimates for the effect of skipping lectures and the effect of PC ownership with the corresponding OLS esti-mates. What about their statistical significance

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try remembering the steps

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i think something is missing in your question because y-1=(x-12) would not pass through the point (-4,-3). because if you replace x by -4 your are supposed to find y=-3 which is not the case her. if you replace x by -4 you find =-15.

i assume the right equation is y-1=1/4*(x-12) because this one is passing through both your points (if you are interested to know how i found that out i can tell you).

in this equation if i replace x by -4 i find y=-3 and if i replace x by 12, i find y=1 so the line representing this equation is passing through those 2 points.

then the standard form of the equation is finding an expression of y in function of x

y-1=1/4*(x-12)

y=x/4-3+1

y=x/4-2

hope that .

do you confirm there was a mistake in the question?

10 b/c 5*2 =10

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