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Sample size determination for confidence intervals on the population mean and on the difference between two
1Department of Laboratory Medicine, University of California, San Francisco 94143.
Biometrics
|September 1, 1989
Abstract:
Sample size determination is usually based on the premise that a hypothesis test is to be used. A confidence interval can sometimes serve better than a hypothesis test. In this paper a method is presented for sample size determination based on the premise that a confidence interval for a simple mean, or for the difference between two means, with normally distributed data is to be used. For this purpose, a concept of power relevant to confidence intervals is given. Some useful tables giving required sample size using this method are also presented.