The sampling plan for the mean for correlated data is studied. The Operating Characteristic (OC) of the variable sampling plan for mean for correlated data are calculated and compared with the OC of known σ case.
Singh, J. R.; Sankle, R.; and Khanday, M. Ahmad
"Variables Sampling Plan For Correlated Data,"
Journal of Modern Applied Statistical Methods: Vol. 12
, Article 10.
Available at: http://digitalcommons.wayne.edu/jmasm/vol12/iss2/10