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Which of the following can cause OLS estimators to be biased? Explain each of the following points: 1)   Heteroscedasticity   2)   Omitting an important variable   3)   A sample correlation coefficient of 0

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Which of the following can cause OLS estimators to be biased? Explain each of the following points:

1)   Heteroscedasticity

2)   Omitting an important variable

3)   A sample correlation coefficient of 0.95 between two independent variables both included in the model.