That's not a two‐sided test! It's two one‐sided tests!
(2022)
Journal Article
Rubin, M. (2022). That's not a two‐sided test! It's two one‐sided tests!. Significance, 19(2), 50-53. https://doi.org/10.1111/1740-9713.01619
When reporting tests of significance, researchers might claim to have conducted a two-sided test when in fact they have conducted two one-sided tests. Mark Rubin explains the confusion and how to avoid it.