1. Which assumption regarding the population residuals of linear regression models is necessary for the variance of a slope estimate to depend only on the variance of population residuals and on the...

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Extracted text: 1. Which assumption regarding the population residuals of linear regression models is necessary for the variance of a slope estimate to depend only on the variance of population residuals and on the variation in independent variables? Explain. 2. Explain intuitively and using maths and graph why a small variation in the independent variables makes the variance of linear regression estimates high.