Question: A study was recently reported comparing the effects of different dietary patterns on blood pressure within an 8week followup period. Subjects were randomized to three

patterns on blood pressure within an 8week followup period. Subjects were randomized

A study was recently reported comparing the effects of different dietary patterns on blood pressure within an 8week followup period. Subjects were randomized to three groups: . A - control diet group (N = 154) o B fruitsandvegetables diet group (N = 154) . C combination (fruits, vegetables, lowfat dairy products, and reduced saturated and total fat) diet group (N = 151) The results reported for the effect of dietary pattern on change in systolic blood pressure (SBP) are given as follows: The sample mean change in fruitsandvegetables group minus sample mean change in control group is 2.8 mm Hg. The 97.5% condence interval for the true mean change in fruitsandvegetables group minus true mean change in control group is (4.7, 0.9). Additionally, suppose we assume that the standard deviation of change in blood pressure is the same in each group and is unknown. Which of the following formulas is the correct one to use to nd the 95% condence interval for the population difference in the mean change in SBP between the fruitsandvegetables group and the control group, (M1 /12)? Indicate the correct choice. 0'2 0'2 1. (:21 E2) 2|: 20.975( \"1 + 17:) 2. (5:1 532) i t0.975,df=n1+n22 (3 nil + 7%) 3. (id: t0.975,df=n1(%> 4- Jib 20.975 (%) 7 7 S2 82 5- ($1 502) i t0.975,alf=d~ \"11 + 77: 6. (:21 E2) 2|: 20.975 (0%) Use the results reported for the effect of dietary pattern on change in systolic blood pressure (SBP) to construct the 95% confidence interval for /1 - /2. Round the lower and upper bounds of the confidence interval to 4 decimal places. Hint: Use the formula you selected in Part c

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