TY  - BOOK
AU  - Gulshan,  S S
AU  - Shukla, M C
TI  - Statitics : theory and practice
U1  - 519 
PY  - 1989///
CY  - New Delhi
PB  - S. Chand and Com-pany Ltd
KW  - clarification
KW  - correlation
KW  - Sampling techniques
ER  -