Using your phone's internet browser
go to:
Click and drag this link to
the Home icon in your browser.

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
  Invite a friend  |  
  Save  |  
 Earn 10 points for answering
Answer this question  Earn 10 points for answering    
4000 characters remaining  
Keep me signed inNew User? Sign up

Answers (1)


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

Report abuse
Not Useful
Your vote on this answer has already been received

Ask a Question

Get answers from the community

600 characters remaining