Question 9 - What type of study sample was involved in this research?

Question 10 - Who were the cases in study? Who were the controls?

Question 11 - In the Data Analysis portion of the article the authors report that they

completed a power analysis to determine the power of their study with the sample size

utilized. They report a power of 90%. What does this mean? Is it adequate?

Question 12 - If the power is 90% what is the likelihood of making a type II error?