There are about 300 registered members in that activity center, but only a few members (about 20 people) are actively going to the activity center. How can I calculate the sample size? I've heard about sampling in prevalence studies but I don't know how to calculate using the given formula. The formula is attached below.
If there are other ways to calculate the sample size, please share with me. I hope you can help me, thank you for your help.
You can use the single proportion formula (the main or outcome variable should be in frequency or percentage). https://www.google.com.mx/url?sa=t&source=web&rct=j&url=https://www.stat.auckland.ac.nz/~wild/ChanceEnc/Ch08.psampsize.pdf&ved=0ahUKEwih_6Gx5ZDVAhWE5yYKHfDwBaMQFggcMAA&usg=AFQjCNFKQtIQKcd2scEngzcMylFbyj4XKQ
You can use the single mean fórmula (the main or outcome variable sholud be in mean) http://sphweb.bumc.bu.edu/otlt/mph-modules/bs/bs704_power/BS704_Power11.html#userbookmark_AnswerBirthWeight-Page3
Please let me know if the following references/sites are helpful to you:
1. Determining Sample Size: How to Ensure You Get the Correct ...
https://www.qualtrics.com/blog/determining-sample-size/Apr 8, 2013 ...
2. Sample Size Calculator - Confidence Level, Confidence Interval ...
https://www.surveysystem.com/sscalc.htm
This Sample Size Calculator is presented as a public service of Creative Research Systems survey software.
Dennis
Dennis Mazur
You can Use G*Power software it's free. http://www.gpower.hhu.de/en.html
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