1a. Drawing on the facts in Myers et al. (2003), write sentence that correctly uses each of the following words:

correlation:

control for:

control group:

confounded:

experiment:

observational study:

1b. What correlation did Myers et al. (2003) find? (one sentence answer)

Answer. They did not find any correlation between methylymercury exposure and cognitive ability. (This is the best answer. I would also accept, for full credit, an answer that cited either of the two statistically significant correlations that Myers did find.)

1c. Give an example of a factor that the Myers et al. study controls for, and a factor that it does not control for. (two sentence answer)

1d. What are the primary confounding variables that Myers et al. are concerned with? (one or two sentence answer)