Use the following to answer questions & through 1 An article in the Thursday, October 25, 2012, edition of the Gazette Times (Study: Aspirin may help treat some colon cancers) reported the following: Aspirin has shown remarkable promise in treating colon cancer in people with mutations in a gene that is thought to play a role in the disease. A major study involved 152 people who had tumors with mutations in the gene thought to play a role in the development of colon cancer. (These 152 were among nearly 175,000 participants in two health studies based at Harvard that began in the 1980s.) Researchers followed these 152 people for five years. Sixty-two of these 152 took aspirin regularly while the rest did not. Of the 62 who took aspirin regularly, 2 died within five years of their cancer diagnosis. Of the 90 who did not take aspirin regularly, 23 died within five years of their cancer diagnosis. 7. What kind of study was performed? a. randomized comparative experiment (a.k.a. completely randomized design) b. randomized block experiment c. stratified random sample d. retrospective observational study e. prospective observational study