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 difference this big could easily occur just by chance even if St. John's wort does no better than the placebo. O The placebo makes no difference in the subjects' depression. 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? O An observational study O An experiment A census A sample survey

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