10 What type of experimental design would you recommend in each of the following cases? Suggest in some detail how you would design each study:

a A test of three methods of compensation of factory workers. The methods are hourly wage, incentive pay, and weekly salary. The dependent variable is direct labor cost per unit of output.
b A study of the effects of various levels of advertising effort and price reduction on the sale of specifi c branded grocery products by a retail grocery chain.
c A study to determine whether it is true that the use of fast-paced music played over a store’s public address system will speed the shopping rate of customers without an adverse effect on the amount spent per customer.