Social Studies, 05.11.2019 05:31 jcross11nate

Astudy was undertaken to test the hypothesis that chewing tobacco increases the risk of stomach cancer. detailed historical data on chewing tobacco use were collected from 400 subjects with newly diagnosed stomach cancer and 400 subjects without stomach cancer. the results revealed that chewing tobacco was not a significant risk factor for stomach cancer. a. descriptive studyb. ecological studyc. cross-sectional study d. case-control study e. retrospective cohort study

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Astudy was undertaken to test the hypothesis that chewing tobacco increases the risk of stomach canc...