A consumer research organization was interested in the influence of type of water on the effectiveness of
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A consumer research organization was interested in the influence of type of water on the effectiveness of a detergent. Test batches of washings were run in four randomly chosen machines having a particular type of water - soft, moderate, and hard. All batches had equal numbers of oil-stained rags and after each washing the number of rags stilled stained was determined. The following results were obtained.
Number of Rags with Stains
Sample
Observations Soft Moderate Hard
1 0 4 10
2 1 8 5
3 2 3 7
4 1 5 10
Using an alpha level of .01, would you conclude that the type of water influences the effectiveness of the detergent?
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