Transcription of Sample Size Formulas - williamgodden.com
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Sample Size Formulas - williamgodden.com
Bill Godden, January 2004 Page 1 of 1 Sample size Formulas You can find the following formulae (or variations thereof) in most statistics textbooks, especially descriptive statistics dealing with probability. Sample size - Infinite Population (where the population is greater than 50,000) Z2 x (p) x (1 p) SS = _____ C2 SS = Sample size Z = Z-valueA ( , for a 95 percent confidence level) P = Percentage of population picking a choice, expressed as decimalB C = Confidence interval, expressed as decimal (.)
Bill Godden, January 2004 Page 1 of 1 Sample Size Formulas You can find the following formulae (or variations thereof) in most statistics textbooks, especially descriptive
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