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There has been debate among doctors over whether surgery can prolong life among men suffering from prostate cancer, a type of cancer that typically develops and spreads very slowly. In the summer of 2003, The New England Journal of Medicine published results of some Scandinavian research. Men diagnosed with prostate cancer were randomly assigned to either undergosurgery or not. Among the 347 men who had surgery, 16 eventually died of prostate cancer, compared with 31 of the 348 men who did not have surgery.
a) Was this an experiment or an observational study? Explain.
b) Create a 95% confidence interval for the difference in rates of death for the two groups of men.
c) Based on your confidence interval, is there evidence that surgery may be effective in preventing death from prostate cancer? Explain.
Bufferin Tablets Listed below are the measured weights (in milligrams) of a sample of Bufferin aspirin tablets. What is a serious consequence of having weights that vary too much?
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Compare the mean of the sampling distribution of sample means with that of the population.
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In the radar system of Example 8.4, show that the ROC in Figure 8.2 is the result of a Neyman-Pearson test. That is, show that the Neyman-Pearson test is a threshold test with acceptance set A0 = {X ≤ x0}. How is x0 related to the false alarm pro..
Patients who were discharged during the year 2009. Using the information obtained from the sample to predict population characteristics with respect to malpractice litigation is an example of?
You are required to provide a critical evaluation on OLS regression analysis. You should review the relevant literature on research methods, explain the underlying philosophy for this research method
After calculating the sample size needed to estimate a population proportion to within 0.04, your statistics professor told you the maximum allowable error must be reduced to just .01. If the original calculation led to a sample size of 800, the s..
Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective.
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