A researcher wishes to determine whether people with high blood pressure can reduce their blood pressure by..?
A researcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet. Subjects were randomly assigned to a treatment group and a control group. The mean blood pressure was determined for each group, and a 95% confidence interval for the difference in the mean for the treatment group and the control group, was found to be (-21, -6). A. We know that 95% of all people who follow the particular diet will have a blood pressure between 6 and 21 points lower than people who do not follow the diet.
B. With 95% confidence, people who follow the diet have an average blood pressure between 6 and 21 points higher than people who do not follow the diet.
C. With 95% confidence, people who follow the diet have an average blood pressure between 6 and 21 points lower than people who do not follow the diet.
D. We know that 95% of all experiments done on the population will show that the average blood pressure for people who follow the diet is between 6 and 21 points lower than the average blood pressure for people who do not follow the diet.
E. We are 95% confident that a randomly selected subject in the treatment group had a blood pressure between 6 and 21 points lower than a randomly selected subject in the control group.
Tagged with: average blood pressure • confidence interval • control group • diet • high blood pressure • population • researcher • treatment group
Filed under: blood pressure treatment
D.
The giveaway is the emphasis on the mean. The confidence rate is based on the range of averages so it would be the average blood pressure of people who follow the diet and the control group’s average BP. D is the only one which fits that criteria.