Prove that a ranked set sample mean is unbiased for estimating the population mean by showing that . In the case the underlying data are generated from U(0, l), prove that the sample variance for the...

Prove that a ranked set sample mean is unbiased for estimating the population mean by showing that
. In the case the underlying data are generated from U(0, l), prove that the sample variance for the RSS mean is strictly less than that of the sample mean from a SRS.