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===Estimator for the mean===

The estimator for the mean for stratified random sampling is derived based on the considerations above and analog to the estimator of [[Simple random sampling|simple random sampling]] as

:<math>\bar y = \sum_{h=1}^L \frac{N_h}{N} \bar y_h  =  \frac {1}{N} \sum_{h=1}^L N_h \bar y_h\,</math>

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