Since sigma is given to us, what are we being asked for in question 3?
Q3 asks you to calculate the standard error for each of your samples. This is a simple calculation based on the standard deviation of each of your samples. This is s-subXbar which is an estimate of sigma-subXbar. You would use this for your hypothesis test if you did not know sigma. Q4 and Q5 ask for hypothesis tests. If you did NOT know sigma, you would use the standard error of the sample that you calculated in Q3 and a t-test. However, you DO know sigma (given to you at the bottom of page 2), so use that to calculate standard error (and which test?). Back to Top Another question about risk ratio Tue, 28 Oct 2008: A student writes: In case-control study, slide 39, it was stated that you cannot calculate relative risk b/c of over-sampling due to equal numbers of both groups. I notice that yesterday, when Dr. Shedden was using the example of breast cancer (slide 52) that the no screening group and screening groups have equal numbers that were selected; it’s also a cohort study. Is risk
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