Question: In a random sample of 170 married British couples, the difference between the husband's and wife's ages had a mean of 2.24 years and a standard deviation of 4.1 years.
a. Test the hypothesis that British men are significantly older than their wives, on average. Specify the value of a that you chose to use.
b. Explain what is meant by the use of the term significant in part (a), and discuss how it compares with the everyday use of the word.