Question

In: Statistics and Probability

Ten different families are tested for the number of gallons of water a day they use...

Ten different families are tested for the number of gallons of water a day they use before and after viewing a conservation video. At the 0.05 significance level, test the claim that the mean is the same before and after the viewing.

  • List the null and alternative hypothesis,
  • the critical value,
  • the test statistic with and sd.
  • Draw the graph and label the test statistic, critical value and rejection regions.
  • Reject or fail to reject?
  • State the conclusion

Before

33

33

38

33

35

35

40

40

40

31

After

34

28

25

28

35

33

31

28

35

33

Solutions

Expert Solution

Let us denote the difference

d =  the number of gallons of water a day they use before -  the number of gallons of water a day they use after

There is not sufficient evidence to support the claim that the mean is the same before and after the viewing.


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