In a study of the effects of diet on blood pressure, one group of 85 people followed a vegetarian diet for 4 months, after which time their mean systolic blood pressure was 15 mm Hg lower than at the start. Another group of 75 people followed a nonvegetarian diet for the same length of time, after which their mean systolic blood pressure was 1 mm Hg lower. If a vegetarian diet had no effect on blood pressure, there would be less than 1 chance in a 100 of getting these results. Which statement is valid based on these results?

A) The difference in the sample size of the two groups makes a conclusion impossible.

B) The recommended diet for lower blood pressure is nonvegetarian.

C) The result is not practically significance.

D) The result is not statistically significant.

Question

Mathematics

Rey Davidson

6 January, 18:30

In a study of the effects of diet on blood pressure, one group of 85 people followed a vegetarian diet for 4 months, after which time their mean systolic blood pressure was 15 mm Hg lower than at the start. Another group of 75 people followed a nonvegetarian diet for the same length of time, after which their mean systolic blood pressure was 1 mm Hg lower. If a vegetarian diet had no effect on blood pressure, there would be less than 1 chance in a 100 of getting these results. Which statement is valid based on these results?

A) The difference in the sample size of the two groups makes a conclusion impossible.

B) The recommended diet for lower blood pressure is nonvegetarian.

C) The result is not practically significance.

D) The result is not statistically significant.

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Answers (1)

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Pranav Petty · Answer 1

Answer: A. The difference in the sample size of the two groups makes a conclusion impossible.

The statement in letter A is very true. It is impossible to come up with a credible conclusion knowing the fact that the sample size for the two groups is not the same. The sample size affects the rate of the mean systolic blood pressure on both groups.