A study in Finland in 1998 suggested that vitamin E pills reduced the risk of prostate cancer in a group of male smokers. This was only one effect in a series of reported successes for vitamin E and other health conditions. A more recent study reported that selenium or vitamin E, used alone or in combination, did not prevent prostate cancer in a population of relatively healthy men ( JAMA , April 2009). Discuss the factors that can cause different medical studies to come to different conclusions.
Answer to relevant QuestionsWhen medical stories in the mass media report dangers of certain agents (e.g., coffee drinking), later research often suggests that the effects may not exist or are weaker than first believed. Explain how this could happen ...An advertisement by Company A says that three of every four doctors recommend pain reliever A over all other brands combined. a. If the company based this claim on interviewing a random sample of doctors, explain how they ...A medical researcher conducts a significance test whenever she analyzes a new data set. Over time, she conducts 100 independent tests. a. Suppose the null hypothesis is true in every case. What is the distribution of the ...Refer to the previous exercise. a. Explain why the alternative hypothesis of bias against males is Ha: p 6 0.60. b. Show that the P-value for testing H0: p = 0.60 against Ha: p 6 0.60 equals 0.90. Interpret. Why is it large? When the 127 workers aged 18–25 in the 2008 GSS were asked how many hours they worked in the previous week, the mean was 37.47 with a standard deviation of 13.63. Does this suggest that the population mean work week for ...
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