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:
Walk After Dark
An activity or measure often used in surveys or research to assess feelings of safety or community crime levels.
Expected Frequency
In statistical analysis, the predicted count of occurrences in a category based on the proportions in the total sample.
Police Job
Employment within a police force or law enforcement agency, entailing responsibilities related to maintaining public order, enforcing laws, and protecting citizens and property.
Walk After Dark
An activity often studied in the context of safety perceptions or crime victimization research.
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