Why medical studies often we a relatively large sample

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Question: A seven-year medical research study reported that women whose mothers took the drug DES during pregnancy were twice as likely to develop tissue abnormalities that might lead to cancer as were women whose mothers did not take the drug.

a. This study involved the comparison of two populations. What were the populations?

b. Do you suppose the dab were obtained in a survey or an experiment?

c. For the population of women whose mothers took the chug DES during pregnancy. a sample of 3980 women showed that 63 developed tissue abnormalities that might lead to cancer. Provide a descriptive statistic that could be used to estimate the number of women out of 10(X) in this population who have tissue abnormalities.

d. For the population of women whose mothers did rot take the drug DES during pregnancy. what is the estimate of the number of women out of 1000 who would be expected to have tissue abnormalities?

e. Medical studies often we a relatively large sample (in this case. 3980). Why?

Reference no: EM131454499

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