Imagine that you are planning a correlational study and know that your sample will be the residents of a particular retirement village. As you will only be able to analyse a fixed number of people, there is a minimum effect size your study will be able to reliably detect. The number of individuals your study will have access to is N = 68.

To find this minimum, conduct a sensitivity analysis in G*Power. What is the smallest correlation your study will be able to reliably detect with 80% Power, using an alpha of .05?

I am not sure which test to use for this analysis in GPower. Can you let me know please?