Prevalence Sample Size. The 99 confidence level 2 To put it more precisely. The mathematics of probability prove that the size of the population is irrelevant unless the size of the sample exceeds a few percent of the total population you are examining.
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Two independent study groups. This means that a sample of 500 people is equally useful in examining the opinions of a state of 15000000 as it would a city of 100000. Sep 21 2012 With a Prevalence P of 20 precision of 005 the table indicates that the sample size required is 246.
The sample proportion is what you expect the results to be.
Two study groups will each receive different treatments. One study group vs. If your population is less than 100 then you really need to survey all of them. Field should be entered.
