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how to calculate sample size. N z 2 p 1 - p e 2 where z 1645 for a confidence level a of 90 p proportion expressed as a decimal e margin of error. Two independent study groups.
How To Calculate Sample Size For Different Study Designs In Medical Research Case Control Study Study Design Medical Studies from www.pinterest.com
Assuming this is the normal distribution let us find the Z value from the Z table. Know your population size. N population size e Margin of error percentage in decimal form z z-score.
Study Group Design vs.
Each of the shaded tails in the following figure has an area of 0025. Know your population size. The sample size n can be calculated using the following formula. Consider your sample size variables 1.
