A scven year medical rescarch study reported that women whos

A scven year medical rescarch study reported that women whosc mothers took the drug DES during pregnancy were twice as likely to develop tissue abnormalities that might lead to cancer as were women whose mathers did not take the drug. a. This study compared two populations. What were the populations? b, Do you suppose the data were obtalned In a survey or in an experiment? c. For the population of women whose mothers took the drug Ds during pregnancy, a sample of 398D women showed that 63 developed tissue abnormalitles that might lead to cancer. Provide a descriptive statistic (to 1 decimal) that could be used to estimate the number of women out of 1,0 in this papulatian who have tissue ahnormalities. out of 1,000 wornen developed tissue abnormalities d. For the population of women whase mothers did nat take the drug DES duri out of 1,000 women developed tissue abnormalities pregnancy, what is the estimate [to 1 decimal] of the number af wormen out of 1,000 who would be expected to have tissue abnormalities? Hint: remember that women whose mothers tock the drug were twice as likely to develop tissue abnormalities.) e. True or false: medical studies cften use a relatively large sample (in this case, 3980) because disease occurrences can be rare and diffioult to observe when only isolated populations are considered.

Solution

a)

Pregnant women those who took DES and those who did not took DES

b)

Survey

c)

Number per 1000 women who developed tissue abnormalities = (63/3980)*1000 = 15.8

d)

Number per 1000 women who developed tissue abnormalities = 2*15.8 = 31.6

e)

True