Which one of the following is not true about the post hoc power value called Observed Power on the IBM SPSS ANOVA results output?

1. It is the actual power obtained at the end of a currently study

2. It is derived in part using the alpha level used in the currently conducted study

3. It is derived in part using the actual post hoc effect size found in the currently conducted study

4. It is derived mostly using previously conducted studies.

5. It is derived in part using the sample size used in the currently conducted study.