I have attempted to use on line tools to work out a population sample size for an experiment I will be running. However I do not really understand the "Percentage" part
I have attempted to use this www.calculator.net Sample Size Calculator but I don't feel happy not understanding it even if most of the information I have read has said to leave it at 50 (the worst case scenario?). The description on the website does not seem to help at all
"Percentage: The percentage of a particular answer was chosen."
"Your accuracy also depends on the percentage of your sample that picks a particular answer..."
My issue is, what answer, and what question?, what if all my survey questions are Likert types scales and the user has to answer them? Everyone who undertakes this survey has to complete it or their answers are not recorded, so is my percentage 100%?
Any help is much appreciated