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:
Treatments
Specific conditions applied to groups in an experiment to determine their effect on an outcome.
Mean Square
In analysis of variance (ANOVA), the average of squared differences from the mean, used to assess within-group and between-group variability.
Error
The difference between the observed value and the true value in statistics and scientific measurements.
Null Hypothesis
A statement used in hypothesis testing that indicates no significant difference or effect.
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