4. In which of the following cases OLS estimation of Healthcare=a+bAge+u will be biased? a) Only include in your estimation sample individuals whose health care spending is more than 500 per year b) Use a random sample c) Healthcare is recorded with some random typing errors. 1 d) The error variance is larger at an older age.
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4. In which of the following cases OLS estimation of Healthcare=a+bAge+u will be biased? a) Only include in your estimation sample individuals whose health care spending is more than 500 per year b) Use a random sample c) Healthcare is recorded with some random typing errors. 1 d) The error variance is larger at an older age.
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