Discussion:
Relationship between direction and one or two tail
Please help with the following abnormal psychology problem. Step by step discussions are provided.
When designing an experiment, the research hypothesis may be directional or non-directional.
Questions:
1) Identify the differences between a directional and non-directional hypothesis.
2) Discuss how the directionality is related to the one- and two-tailed t-test.
3) Is there an assumption that is violated if a two-tailed t-test is used with a directional hypothesis? Please explain your reasoning.