Suppose you were presented with the results of a study comparing a vegetarian di

Question

Suppose you were presented with the results of a study comparing a vegetarian diet to a meat diet. You are told 160 volunteers were randomly assigned to the two diets so that 80 were on the vegetarian diet and 80 were on the meat diet. At the end of 4 months, the blood pressures are checked and a difference of 12 mm Hg in mean systolic blood pressure is found between the two groups. The investigator reports that a two sample t-test shows this difference is statistically significant.

Critique what you are told about this study. Is there a stated objective? What additional information would be helpful? What questions or concerns do you have? How do you interpret these findings? Are these results conclusive? How might this type of study be improved?

Explanation / Answer

Ans: State objective is to compare the mean difference of these two groups.

If the sample is provided, the test will be helpful because the 2 sample t-test is conducted under the assumption of samples are follow normal distribution. Hence, we required to check this assumption.

Question: Which group have higher blood pressure?

Interpret the finding: There is significant difference between the means of the two blood pressure groups at alpha level of significance.

Are these results conclusive?

No, bettwer to test which one has higher blood presuure?

How might this type of study be improved?

Ans: To test using one tait t-test.

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