00435nam a22001217a 4500020002400000082001600024100002400040245002400064260003900088300003400127500005000161650010200211  a9788126515240 (pbk)  a311.21bCOC  aCochran, William G.  aSampling techniques  aDelhibWiley India Pvt. Ltd.c2015  axvi, 428 p.b: ill.c; 23 cm.  aIncludes bibliographical references and index  aStatisticsvSample techniquesvRandom samplingvCluster samplingvDouble samplingvResearchvFBSH