Quanto vale o valor esperado E(χ2) da variável aleatória χ2=(n−1)s2/σ2 ?


a. E(χ2)=0


b. E(χ2)=1

c. E(χ2)=n−1

d. E(χ2)=s2


e. E(χ2)=σ2 display style blank
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