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Chapter 28, Question 1.
Assumptions underlying linear regression

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Select all of the following statements which you believe to be true. If the assumptions underlying a linear regression analysis are satisfied then we should find that:

The residuals are positive.
The mean of the residuals is equal to zero.
The variance of the residuals is equal to zero.
The residuals are linearly related to the independent variable, x.
The residuals are Normally distributed.