In Exercise 7.2.13 the statistic used was the mean of the difference in ages (husband’s age − wife’s age). Explain how the following things would change (or not) if you used the mean of the wife’s ages − husband’s ages as your statistic when you conducted this test? 

a. Observed statistic 

b. Alternative hypothesis 

c. p-value 

d. Conclusion

Data from Exercises 7.2.13

To investigate whether people tend to marry spouses of similar ages or whether husbands tend to be older than their wives, a student gathered age data from a sample of 24 couples, taken from marriage licenses filed in Cumberland County, PA, in June and July 1993. The data file MarriageAges contains the data.