Question: (a) Show that 2 given in (12.23) is unbiased for 2 . (b) Show that 2 1 given in (12.26)

(a) Show that 

σ

2

ν given in (12.23) is unbiased for σ2

ν.

(b) Show that 

σ

2 1 given in (12.26) is unbiased for σ21

.

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