If our diet actually made people gain weight, this would not show up as a significant result on a one tailed test. However, if we conducted a two tailed test, a difference in either direction would ...

As these two examples show, the two-tailed test enters the fray when the researcher has a strong claim in place and ventures to ... the OTT is the one to call when testing a directional hypothesis.

In hypothesis testing, an analyst tests a statistical sample, intending to provide evidence on the plausibility of the null hypothesis. Statistical analysts measure and examine a random sample of ...