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how to determine sample size pdf. 4 pp426-432 Mason M. Sample size policy for qualitative studies using in-depth interviews.
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How to make sure you get the correct sample size. The discussion of sample size will have to be addressedin terms of standardizedunits. S X 2 NP 1-P d 2 N-1 X 2 P1-P S required sample size X 2 the table value of chi-square for one degree of freedom at the desired confidence level N the population size P the population proportion assumed to be 50 since this would provide the.
One method is to combine responses into two categories and then use a sample size based on proportion Smith 1983.
The sample size is a significant feature of any empirical study in which the goal is to make inferences about a population from a sample. You can use the formula to calculate a sample size for a confidence level of 99 and margin of error -1 01 using the standard deviation suggestion of 05. Absolute precision or accuracy normally set at 005. Techniques for estimating sample size and performing power analysis depend mainly on the design of the study and the main measure of the study.
