Analyze each of the following investigations, or arguments, and indicate which of the methods of causal reasoning—Mill’s methods—are being used in each of them:

Prof. Norbert Schwartz, of the University of Michigan, conducted the following experiment. He tested the attitudes of people who had just used a University of Michigan copying machine in which, for some subjects, he had planted a dime (which they found), while for others there was no windfall dime. After using the copier, subjects were asked how happy they were about life. Those who had found a dime were consistently more upbeat about “their lives as a whole,” and about the economy and many other matters. “We found,” said Prof. Schwartz, “that a dime can make you happy for about twenty minutes. Then the mood wears off.”
—N. Schwartz, Well Being: Foundations of Hedonic Psychology (New York: Russell Sage Foundation, 1999)