Let X1,.,Xn be i.i.d with n 2 6, E(Xi) > 1 and Var(Xi) > 0. X1x2 and X3X5 are then. (A) not independent, but identically distributed. (B) not identically distributed, but independent. (C) independent and identically distributed. (D) neither independent nor identically distributed.

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A: It is an important part of statistics. It is widely used.

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Q: 36. Show that if X and Y are identically distributed, not necessarily indepen- dent, then Cov(X + Y,…

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Q: For the random variables X,Y Cov(X,Y) = -0.9 if Z=3-X then what is Cov(Z,Y)=???

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.