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:
Events of Heiji Period
A tumultuous period in Japanese history marked by the Heiji Rebellion in 1159-1160, a power struggle between rival samurai clans.
Sanjo Palace
The Sanjo Palace, historically significant in Japan, served as the residence for noble families and is recognized for its architectural design and historical importance in Japanese culture.
Night Attack
A military tactic involving surprise attacks on enemy forces or positions under the cover of darkness.
Heian
A period in Japanese history (794–1185 CE) known for its significant cultural development, especially in literature and art, under the rule of the imperial court in Kyoto.
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