Abstract
Given three production processes, the units from which fail in accordance with the Weibull distribution with unknown scale parameter, the problem of selecting the particular process with the larger mean life is considered. Thre procedures are considered and for large number of observations it is shown that the procedure of type [N, C, R] yields relatively high efficiencies. (All efficiencies considered are relative to the type [N, B, T_R].) The paper also examines the robustness of these procedures.
