[Expert Solution]: An epidemiologist performed a case-control…

An epidemiologist performed a case-control study examining whether tobacco use was associated with oral cancer. The investigator recruited a random sample of 75 adults with oral cancer and 72 adults without oral cancer. Participants were interviewed and asked about their history of tobacco use. What is the null hypothesis for this study? Tobacco use is more common among people with oral cancer than among those without oral cancer. Tobacco use is less common among people with oral cancer than among those without oral cancer. There is no association between tobacco use and oral cancer.