TY  - BOOK
AU  - Purves, Roger
AU  - Freedman, David
TI  - Statistics. (3rd ed.)
SN  - 0393970833
AV  - QA 276 Fre 
PY  - 1997///
CY  - New York
PB  - W. W. Norton and Company
KW  - MATHEMATICAL STATISTICS
ER  -