A researcher is commissioned by a policy maker to conduct an empirical investigation. The researcher needs to collect data and hence asks the policy maker for a grant. After the grant application is approved the researcher demands for more financial support to collect more data and increase its sample size. The researcher claims that the advantage of a bigger sample size is removing the bias from estimation. a) Explain what omitted variable bias is. [5 marks] b) Based on what you learnt in this module, do you agree or disagree with the researcher's claim that "bigger sample size removed the omitted variable bias". Discuss. [10 marks]