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Artusartos

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a) Show that this second probability statement can be written as

[tex]P((n-1)S^2/b < \sigma^2 < (n-1)S^2/a) = 0.95[/tex].

I could do this by flipping all of them, changing the signs...and then mulitplying all of them by (n-1)S^2.

b) If n=9 adn s^2 = 7.93, find a 95% confidence interval for [tex]\sigma^2[/tex].

Here, I just substitute n=9 and s^2=7.93 to the formula, right?

c) If [tex]\mu[/tex] is known, how would you modify the preceding procedure for finding a confidence interval for [tex]\sigma^2[/tex].

I am confused with this one...so can anybody give me a hint or something?

Thanks in advance