Answer the following questions as succinctly as possible. What is the primary th

Question

Answer the following questions as succinctly as possible. What is the primary thing that a researcher can do to improve the precision of an unbiased estimator? Explain. The following webcomic was published in March of 2009, http://kcd.com/552 I USED TO THINK THEN I TOOK A SOUNDS LIKE THE CORRELATION IMPUEDSTATISTICS CLASS. CASS HELPED CAUSATION. 1. 2. Now I DONT WELL, MAYBE. Explain the last line: "Well, maybe." You are trying to estimate the effect of a college education on later life earnings. Why is the difference between the mean earnings of college graduates and the mean earnings of non-college graduates not a good estimate of the causal effect of a college degree on earnings? 3. 4. Explain using the potential outcomes notation how random assignment can eliminate selection bias 5. In the TED Talk by Ionica Smeets, The dangers of mixing up correlation and causation, she discusses the relationship between longevity and marriage. According to the video, explain the true causal link between these two variables [Video is posted on blackboard in the Course Content area]

Explanation / Answer

Researchers can improve precision by increasing the sample size. According to Central Limit Theorem as sample size increases the population tends to be normal.

Also, we can improve precision by including good variables.

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