7.l.4. Use the
that (11 - 1)S2/a2 is a chi square random variable with n 1df to prove
Hint: Use that the variance of a chi square random variable with k df i:s 2k.
7.J..5. Y1, . . . , a random sample from a normal distribution.. Use the statement Question 7.3.4 to prove that S2 is consistent for a2•
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