Nutritional researchers conducted an investigation of two high-fiber diets intended to reduce serum cholesterol level. Twenty men with high serum cholesterol were randomly allocated to receive an "oat" diet or a "bean" diet for 21 days. The table summarizes the fall (before minus after) in serum cholesterol levels. Use a t test to compare the diets at the 5% significance level.

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Fall in cholesterol (MG/DL) Diet Oat 10 Bean 10 Mean 53.6 31.1 55.5 29.4 SD