Chapter 4.2, Problem 89E

To determine

To describe how you would design and carry out an experiment to answer this question using $\text{50}$ adults male volunteers.

Explanation of Solution

In the question, researcher want to find out which of the two brands of electric razor shaves closer. So, we have been given $\text{50}$ adults male volunteers to test the effectiveness of the two brands of electric razors. So, let us random divide the $\text{50}$ volunteers in two groups of half the number of volunteers each. The first group of $\text{25}$ volunteers uses the first brand of electric razor each while the second group of $\text{25}$ volunteers uses the second brand of electric razors. We then compare the length of the hairs after the shaving between the two groups. The outline of the experiment is as follows: