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[Past question paper problem.1Hi,this is a past exam paper 

I am practising for multiple linear regression.I am stuck at this question.For For example I have B=(X'X)^-1X'Y but I cannot go further and make He to be a part of the model.Any Any suggestions on how to proceed??.Many thanks

[Past question paper problem.1Hi,this is a past exam paper I am practising for multiple linear regression.I am stuck at this question.For example I have B=(X'X)^-1X'Y but I cannot go further and make He to be a part of the model.Any suggestions on how to proceed??.Many thanks

Past question paper problem.1 

I am stuck at this question. For example I have B=(X'X)^-1X'Y but I cannot go further and make He a part of the model. Any suggestions on how to proceed?

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Multiple linear regression problem

[Past question paper problem.1Hi,this is a past exam paper I am practising for multiple linear regression.I am stuck at this question.For example I have B=(X'X)^-1X'Y but I cannot go further and make He to be a part of the model.Any suggestions on how to proceed??.Many thanks