Q1) You want to know if there is relationship between smoking and depression. You conduct a case-control study where you randomly select 100 people with depression and 100 people without depression. You ask all 200 subjects whether they have ever smoked or not. Which kind of confidence interval will help you to address the research question?

a. Confidence Interval for the Risk Difference

b. Confidence Interval for the Risk Ratio

c. Confidence Interval for the Odds Ratio

d. Confidence Interval for the Correlation

e. Confidence Interval for the Difference in Two Means

Q2) Consider the data taken from a study that attempts to determine whether the use of electronic fetal monitoring (EFM) during labor affects the frequency of Cesarean section deliveries. Of the 5824 infants included in the study. 2850 were electronically monitored and 2974 were not. The outcomes are given in the 2x 2 contingency table below.

9:27 AM Mon Nov 91% 88 Q N 27448468 ~ + X . .. alth Rep... X PUBH 6400 x 1758-2652-12-37 x www.hsph.harvard... x academic.oup.com x journals.lww.com X Yordanos Meshes... X 27448468 Cesarean No Cesarean section Total section Electronic monitoring 358 2492 2850 No electronic monitoring 229 2745 2974 Total 587 5237 5824 The sample risk difference (RD) and sample relative risk (RR ) for having a Cesarean delivery comparing those with electronic monitoring to those without electronic monitoring are calculated. Choose the correct solution. a. RD = 0.049, RR = 1.631 b. RD = 0.049, RR = 0.631 c. RD = -0.049, RR = 0.536 d. RD = 0.687, RR = 7.920 e. RD = 1.866, RR = 0.536A company makes chewable vitamins in four flavors. They claim that the percentages of the types of flavors are 40% orange, 30% cherry, 20% grape, and 10% lime. To test this claim, a random sample of 1000 vitamins is selected and a X2 goodness-offit test yields a test statistic value of X2 = 19.0. Which statement below is correct? a. There is evidence that the flavor proportions are not 40% orange and not 30% cherry and not 20% grape and not 10% lime at the 1% level of significance b. There is evidence that the flavor proportions are 40% orange, 30% cherry, 20% grape, and 10% lime, at the 5% level of significance c. There is evidence that the flavor proportions are really 25% orange, 25% cherry, 25% grape, and 25% lime at the 1% level of significance d. There is evidence that the flavor proportions are really 25% orange, 25% cherry, 25% grape, and 25% lime at the 5% level of significance e. None of the responses above are correct Question 9 A survey sample of 1000 Canadians reveals that 585 believe that there is too much violence on television. A survey sample of 1500 Americans reveals that 780 believe that there is too much violence on television. To test at the 5% significance level whether or not the data provide evidence that the proportion of Canadians who believe that there is too much violence on television is not equal to the proportion of Americans who believe that there is too much violence on television, an investigator sets up the following hypotheses: H0 : p = 0.585 vs. H1 : p at 0.585, where p is the proportion of Americans who believe that there is too much violence on television. Which one of the following is a true statement? a. The student has set up the correct one-sample hypothesis test b. The sample sizes are too small to conduct a hypothesis test c. Given that 780 + 1500 = 0.52, the alternative hypothesis should be H1 : p