Cochran Formula. If Y Ny vc This follows at once from thee Example. Formula For Calculating A Sample For Proportions For populations that are large Cochran 196375 developed the Equation 1 to yield a representative sample for proportions.
London Cochran presents an introduction to the book and to the methods of sampling theory in an introduction. T2 p q no --------------- d2 1962 5 5 no ----------------- 384 052 Where t value for selected alpha level of025 in each tail 196 the alpha level of05 indicates the level of risk the researcher is willing to take. 196 for 95 confidence level p percentage picking a choice expressed as decimal.
When the null hypothesis is rejected we can perform followup pairwise Cochrans Q tests which are equivalent to McNemars tests to better identify where the differences lie.
Z 2 p 1-p c 2. 1963 Sampling Techniques Wiley New York. STAT30143914 Applied Statistics-Sampling Preliminary References 1Cochran WG. N1 384 1384528 222.
