15.37 Advertising Campaigns The results of an experiment to investigate product recognition for three advertising campaigns were reported in Example 11.15. The responses were the percentage of 400 adults who were familiar with the newly advertised product. The normal probability plot indicated that the data were not approximately normal and another method of analysis should be used. Is there a significant difference among the three population distributions from which these samples came? Use an appropriate nonparametric method to answer this question.

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Campaign 1 2 3 0.33 0.28 0.21 0.29 0.41 0.30 0.21 0.34 0.26 0.32 0.39 0.33 0.25 0.27 0.31