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how to find the sample size. Use Excel to find a sample size. Then calculate your confidence level which is how confident you are in percentage terms that your results will fall within your margin of error and z-score a constant value linked to your confidence level.
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As such the determination of the appropriate sample size is one of the recurrent problems in statistical analysis. N population size e Margin of error percentage in decimal form z z-score. More than two groups supported for binomial data.
X S xi n Here x represents the sample mean S tells us to add xi refers to all the X-values and n stands for the number of items in the data set.
The region to the left of and to the right of 0 is 05 0025 or 0475. 258 2 05 1-05 001 2 665605 0500001 16641 The sample size for the chosen parameters should be 16641 which is a very large sample. To calculate sample size first find the population size or number of people taking your study and margin of error which is the amount of error youll allow in your results. To calculate the adjusted sample size we divide the total expected sample size by one minus the proportion expected to dropout 010 in this case.
