Chapter 4.2, Problem 91E

To determine

To select the best answer for this what this experiment has.

Answer to Problem 91E

Option (c) is the correct option.

Explanation of Solution

In the question, the researcher wants to know that can charging diet reduce high blood pressure. The four diets are as:

1. Normal diet with unrestricted salt.
2. Vegetarian diet with unrestricted salt.
3. Normal diet with restricted salt.
4. Vegetarian diet with restricted salt.

We then note that we either have a normal or vegetarian diet which is the first factor. We also note that we have the option between restricted and unrestricted salt, which is the second factor. Thus there are two factors are as: normal or vegetarian diet and unrestricted or restricted salt. Thus, option (c) is the correct option.