# 31809 physical description disney characters pictionary 2

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## Statistical Description of Data part 2

... deﬁnitions into sums of various powers of the data, e.g., the familiar    N  x2  − N x2  ≈ x2 − x2 (14.1.7) Var(x1 xN ) = j N −1 614 Chapter 14 Statistical Description of Data Semi-Invariants ... signiﬁcance of a difference of means is not the number of standard deviations that they are apart, but the number of so-called standard errors that they are apart The standard error of a set of values ... powers of the semi-invariants, 3 /2 Skew(x) = I3 /I2 Kurt(x) = I4 /I2 (14.1. 12) A Gaussian distribution has all its semi-invariants higher than I2 equal to zero A Poisson distribution has all of its...
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## ORGANIC AND PHYSICAL CHEMISTRY OF POLYMERS phần 2 ppt

... ε11 n1 n2 Xε 12 n1 ε11 n2 X 22 + + − + 2( n1 + n2 X) 2( n1 + n2 X) (n1 + n2 X) 2 or Hmix = zX n1 n2 ε 12 (n1 + n2 X) with ε 12 = ε 12 22 ε11 + 2 Strong interactions result in negative values of ε If ... n2 n2 X2 n1 n2 X 1 z ε11 + z 22 + z ε 12 n1 + n2 X n1 + n2 X n1 + n2 X 56 THERMODYNAMICS OF MACROMOLECULAR SYSTEMS and the enthalpy of mixing is established as follows: Hmix = z n2 X2 22 n2 ... = RT C2 + M2 (1 /2 − χ 12 )V V10 C2 + V2 C2 + · · · 3V10 = RT(A1 C2 + A2 C2 + A3 C2 + · · ·) (4 .26 ) where A1 , A2 , and A3 , the virial coefﬁcients, correspond to A1 = , M2 A2 = [1 /2 − χ 12 ]V ,...
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