3.27 Online sales of running shoes. A company that sells running shoes online wants to compare two new marketing strategies. They will test the strategies on 10 weekdays. In the morning of each day, a web page describing the comfort of the running shoes will be displayed. In the afternoon of each day, a web page describing the discounted price for the shoes will be displayed. Sales of the featured running shoes in the morning will be compared with sales in the afternoon at the end of the experiment.

1. (a) What are the experimental units, the treatments, and the outcomes for this experiment? Explain your answers.

2. (b) Is this a comparative experiment? Why or why not?

3. (c) Could the experiment be improved by using randomization? Explain your answer.

4. (d) Could the experiment be improved by using a placebo treatment? Explain your answer.