Question: A sample of 50 randomly selected men with high triglyceride levels consumed two tablespoons of oat bran daily for 6 wks. After 6 wks. 60% of the men had lowered their triglyceride level. A sample of 80 men did the same, and after 6 wks. 25% had lower triglyceride levels. Is there a significant difference in the proportions, at the a=0.01 level of significance?