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 compared two populations. What were the populations? Women whose mothers took DES during pregnancy and women whose mothers did not. b. Do you suppose the data were obtained in a survey or in an experiment? c. For the population of women whose mothers took the drug DES during pregnancy, a sample of 3,980 women showed that 63 developed tissue abnormalitie: that might lead to cancer. Provide a descriptive statistic (to 1 decimal) that could be used to estimate the number of women out 1,000 in this population wr have tissue abnormalities. out of 1,000 women developed tissue abnormalities d. For the population of women whose mothers did not take the drug DES during pregnancy, what is the estimate (to 1 decimal) of the number of women out 1,000 who would be expected to have tissue abnormalities? (Hint: remember that women whose mothers took the drug were tice as likely to deve abnormalities.) out of 1,000 women developed tissue abnormalities e. True or false: Medical studies often use a relatively large sample (in this case, 3,980 ) because disease occurrences can be rare and difficult to observe wher only isolated populations are considered