Amedical study wanted to test the claim that stent implantation wasless effective for clearing arteries of plaque than medical therapyalone. 15.6% of the patients treated with medical therapy aloneexperienced another cardiovascular event (heart attack, stroke ordeath) within four years of their surgery. 187 of the 1,083patients treated with stent implantation experienced anothercardiovascular event (heart attack, stroke or death) within fouryears of their surgery. Test the medical study's claim at a 0.01level of significance that more patients suffered a heart attack, astroke or died after their surgery.
