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formula for sample size selection. N the estimate of the population size 2043 cancer cases among female Therefore. Can be solved for n yielding n 4 W2 1 B2 where B is the error bound on the estimate ie the estimate is usually given as within B.
How To Choose A Sample Size For The Statistically Challenged Tools4dev from www.tools4dev.org
Sample is the part of the population that helps us to draw inferences about the population. The z-score is the number of standard deviations a given proportion is away from the mean. Nf desired sample size when population is less than 10000.
Since the target population in this study is less than 10000 and formula to find nf is used.
132 ISSUES 1321 In practice such formulae cannot be used The simple formula above is adequate for giving a basic impression of the calculations required to establish a sample size. The formula for the sample size can be written mathematically as follows. Thus we need an appropriate sample size so that we can make inferences about the population based on that sample. Nowadays the use of specialist software for sample size determination such as NQuery PASS or Power and Precision is common.
