READER’S DIGEST:
THE STATISTICAL POWER OF ABNORMAL-SOCIAL PSYCHOLOGICAL RESEARCH: A REVIEW” BY JACOB COHEN
In 1962, Jacob Cohen wrote an important article about a fundamental problem in the way psychologists conduct their studies. He noted that psychologists pay a lot of attention to the problem that a statistically significant result might be a false-positive finding (a so-called type-I error). At the same time, psychologists mostly ignored the complementary error that a study might fail to reject the null-hypothesis when the predicted effect actually exists (a so called type-II error).
It is surprising that researchers would not be concerned with type-II errors because studies are often designed to demonstrate effects and a study is considered a failed study if it does not provide evidence for a predicted effect. Most researchers do not even bother to write up these studies. Given the high investment of researchers in their theories, one would expect…
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Utopia, you are standing in it! 
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