Can changing diet reduce high blood pressure? Vegetarian diets and low-salt diet

Question

Can changing diet reduce high blood pressure? Vegetarian diets and low-salt diets are both promising. Men with high blood pressure are assigned at random to four diets: (1) normal diet with unrestricted salt; (2) vegetarian with unrestricted salt; (3) normal with restricted salt; and (4) vegetarian with restricted salt. The 240 subjects are labeled 001 to 240. Software assigns an SRS of 60 subjects to Diet 1, an SRS of 60 of the remaining 180 to Diet 2, and an SRS of 60 of the remaining 120 to Diet 3. The 60 who are left get Diet 4.

(a) This is an example of which of the following?

randomized comparative experiment

matched pairs design  

completely randomized design

an observational study

double-blind design

Explanation / Answer

This is an example of completely randomized design

If each experimental unit has the same chance of receiving any treatment, then the experiment is called a completely randomized design. Here, all individuals are having equal chance of receiving a particular diet. So, it can be said that this is an example of completely randomized design.

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