Question 4 1 pts The study found the difference in treating major depression as

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Question 4 1 pts The study found the difference in treating major depression as measured by improvement in HAM-D scores between St. John's wort and the placebo was not statistically significant with 95% confidence. This means that: o We cannot calculate a 95 percent confidence interval. A differ big could easily occur just by chan even he placebo makes no difference in the subjects' Question 5 1 pts Do doctors in managed care plans give less charity care? Researchers chose 60 communities at random, then chose doctors at random in each community. In all, they interviewed 10,881 doctors. Overall, 77.3% of the doctors said they had given some care free or at reduced rates in the month before the interview because of the patient's financial need. This study is which of the following? An observational study o e An experiment A census A sample survey P Question 6 1 pts The effect of a confounding variable on the response the effect of the explanatory variable on variable the response variable. always equals is always larger than o is always smaller than o cannot be separated from can be separated from

Explanation / Answer

Question 4:

We are given that the placebo is not statically significant with 95% confidence. This essentially means that it is no different from the results we obtain using the actual product or it makes no difference in the subject's depression. Thus option 3 is the correct answer

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