This prompted a memory of something I read in one of my undergrad psychology books a few years ago, which is probably referencing the same study, though using two different examples and one the same as the above example (though the phrasing is slightly different). Here is the extract:

Hindsight (After-the-Fact understanding)

Many people erroneously believe that psychology is nothing more than common sense. "I knew that all along!" or "They had to do a study to find that out?" are common responses to some psychological research. For example, decades ago a New York Times book reviewer criticized a report titled The American Soldier (Stouffer et al., 1949a,1949b), which summarized the results of a study of the attitudes and behavior of U.S. soldiers during World War II. The reviewer blasted the government for spending a lot of money to "tell us nothing we don't already know."

1. Compared to White soldiers, Black soldiers were less motivated to become officers.

2. During basic training, soldiers from rural areas had higher morale and adapted better than soldiers from large cities.

3. Soldiers in Europe were more motivated to return home while the fighting was going on than they were after the war ended.

You should have no difficulty explaining these results. Typical reasoning might go something like this: (1) Due to widespread prejudice, Black soldiers knew that they had little chance of becoming officers. Why should they torment themselves wanting something that was unattainable? (2) It's obvious that the rigors of basic training would seem easier to people from farm settings, who were used to hard work and rising at the crack of dawn. (3) Any sane person would have wanted to go home while bullets were flying and people were dying.

Did your explanations resemble these? If so, they are perfectly reasonable. There is one catch, however. The results of the actual study were the opposite of the preceding statements. in fact, Black soldiers were more motivated than White soldiers to become officers, city boys had a higher morale than farm boys during basic training, and soldiers were more eager to return home after the war ended than during the fighting. When told these actual results, our students quickly found explanations for them. In short, it is easy to arrive at reasonable after-the-fact explanations for almost any result.

Source:Pass, M. W. & Smith, R.E. (2007) Psychology:The Science of Mind and Behavior (Third Edition). McGraw HIll: Boston, pages 31-32

In hindsight, I guess I must have known that it would be a good idea to hang on to my undergrad textbooks. Or did I?