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TWO-PHASE SAMPLE SIZE ESTIMATION WITH PRE-ASSIGNED VARIANCE UNDER NORMALITY ASSUMPTION | ||
| Iranian Journal of Science | ||
| مقاله 8، دوره 34، شماره 4، اسفند 2010، صفحه 349-353 اصل مقاله (129.09 K) | ||
| نوع مقاله: Regular Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijsts.2010.2185 | ||
| نویسندگان | ||
| M. SALEHI* 1؛ P. S. LEVY2؛ J. RAO3 | ||
| 1Department of Mathematics, Statistics and Physics, Qatar University, Doha, Qatar Department of Mathematical Sciences, Isfahan University of Technology, Isfahan, I. R. of Iran | ||
| 23RTI International, Research Triangle Park, North Carolina, USA | ||
| 3School of Mathematics and Statistics, Carleton University, Ottawa, Canada | ||
| چکیده | ||
| We develop a two phase sampling procedure to determine the sample size necessary to estimate the population mean of a normally distributed random variable and show that the resulting estimator has preassigned variance and is unbiased under a regular condition. We present a necessary and sufficient condition under which the final sample mean is an unbiased estimator for the population mean. | ||
| کلیدواژهها | ||
| Population mean؛ sample size determination؛ two phase sampling | ||
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