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Alternative Hypothesis. The alternative hypothesis is the hypothesis used in hypothesis testing that is contrary to the null hypothesis. It is usually taken to be that the observations are the result of a real effect (with some amount of chance variation superposed). SEE ALSO: Hypothesis, Hypothesis Testing, Null Hypothesis.
A type II error fails to reject (accepts) the null hypothesis, although the alternative hypothesis is the true state of nature.It confirms an idea that should have been rejected, claiming that two observances are the same, even though they are different.n example of a type II error would be a pregnancy test that gives a negative result, even though the woman is in fact pregnant. In this example, the null hypothesis would be that the woman is not pregnant, and the alternative hypothesis is that she is pregnant.