The New York Times article "Modern German Duty: The Obligation to Play" reports that "Germans work fewer hours per year than anybody else in the advanced industrial world—1,557 hours a year in the former West Germany, compared with 1,605 for France, 1,683 for Britain and more than 1,900 for the United States . . ."29

a. Find the difference in mean hours worked per year, Americans minus Germans, and divide by 40 to find approximately how many fewer workweeks there are for Germans.

b. Tell whether the variable for hours worked is explanatory or response, and whether it is quantitative or