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In an experiment to assess the effect of diet on blood pressure, 154 adults were placed on a diet rich in fruits and vegetables. A second group of 154 adults was placed on a standard diet. The blood pressures of the 308 subjects were recorded at the start of the study. Eight weeks later, the blood pressures of the subjects were measured again and the change in blood pressure was recorded for each person. Subjects on the fruits-and vegetables diet had an average drop in systolic blood pressure of 2.8 mm Hg more than did subjects on the standard diet. A 97.5% confidence interval for the difference between the two population means is (0.9, 4.7). Interpret this confidence interval. That is, explain what the numbers in the interval mean.Also answer: Does the interval suggest that the means of the blood pressure are different?

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