How to determine test a one side or two side test
How can we determine if a test can be a one side or two side
Thanks for reaching out.
The decision between a one-sided and a two-sided test stems from the specific question you are seeking to answer. If the question is about checking for a difference in any direction (greater or lesser), a two-sided test is appropriate. If the question is specifically about whether a parameter is greater than or less than a certain value, but not both, then a one-sided test is used.
The choice between a one-sided and a two-sided test should be driven by the specific hypothesis or research question you are investigating
Hope this helps.