two-phase sample size estimation with pre-assigned variance under normality assumption
نویسندگان
چکیده
we develop a two phase sampling procedure to determine the sample size necessary to estimatethe 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.
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عنوان ژورنال:
iranian journal of science and technology (sciences)ISSN 1028-6276
دوره 34
شماره 4 2010
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