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Q.

What is cochran formula for sample size determination

Tags: cochran formula for sample size determination
Asked by ahmar uddin mohd, 30 Apr '08 11:32 am
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In any population, there are numerous variables. The researcher must make decisions as to which variables will be incorporated into sample size calculations. Cochran (1977) addressed this issue by stating that One method of determining sample size is to specify margins of error for the items that are regarded as most vital to the survey. An estimation of the sample size needed is first made separately for each of these important items. When these calculations are completed, researchers will have a range of ns, usually ranging from smaller ns for scaled, continuous variables, to larger ns for dichotomous or categorical variables. The researcher should make sampling decisions based on these data. If the ns for the variables of interest are relatively close, the researcher can simply use the largest n as the sample size and be confident that the sample size will provide the desired results. More commonly, there is a sufficient variation among the ns so that we are reluctant to choose the ...more
Answered by Sudhir Surwade, 30 Apr '08 04:07 pm

 
  
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