A soap manufacturer is experimenting with several formulas of soap powder. Three of the formulas were selected for further testing by a panel of homemakers. The ratings for the three formulas are as follows: 
The soap manufacturer decided to use the Kruskal-Wallis test. What is the null hypothesis?
Definitions:
Deceptive Advertising
Marketing practices that mislead or trick consumers into believing something about a product or service that is not true.
FTC Action
Measures taken by the Federal Trade Commission, an independent agency of the United States government, to enforce antitrust laws and protect consumers from deceptive business practices.
Cooling-Off Rule
A regulation that allows consumers a set period to cancel agreements or contracts without penalties.
Salesperson
An individual who sells goods or services to customers for a living.
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