Ten different families are tested for the number of litres of water a week they use before and after viewing a conservation video.Do the data suggest that the amount after the viewing differs from the amount before the viewing? Perform a Wilcoxon signed rank test at the 5% significance level.

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The Answer of Ten different families are tested for the number of litres of water a week they use before and after viewing a conservation video.Do the data suggest that the amount after the viewing differs from the amount before the viewing? Perform a Wilcoxon signed rank test at the 5% significance level.

Ten Different Families Are Tested for the Number of Litres