INTRODUCTION TO THE PRACTICE OF STATISTICS * A7 c& f0 W- J( |& w+ f
5TH EDITION ( d8 f# K& H. W- ]/ x `, ]AUTHER: DAVID & GEORGE $ p. L0 [) q7 T+ ^/ s5 e& J- F9 b1 c- }& w4 v- z
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