There are times when you’ll need weigh costs or practicality with desired results.
We would all like to survey our entire target audience, but that’s not doable for us regular folks.
Enter power studies.
Power studies are great for when you’re in the beginning stages of your project.
With a power study, I can tell you the minimum number of participants needed for a good enough (we decide what’s good enough) study. In this particular case, I let some pharmacists know that they only needed to recruit 128 people to get good data. I can also work backwards and tell you how powerful your study is given how many people you’ve sampled.