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formula for calculating sample size in research. Sample size for qualitative research. This equation is for an unknown population size or a very large population size.
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SS Z² x p x 1-pM². N Population size Z Critical value of the normal distribution at the required confidence level p Sample proportion e Margin of error. The formula to calculate sample size is.
If your population is smaller and known just use the sample size calculator.
Therefore our sample size is 207 low income earners that will be drawn randomly from Abakaliki metropolises. In terms of the numbers you selected above the sample size n and margin of error E are given by where N is the population size r is the fraction of responses that you are interested in and Z c 100 is the critical value for the confidence level c. The confidence interval also called margin of error is the plus-or-minus figure usually reported in newspaper or television opinion poll results. The formula to calculate sample size is.
