7.5.6. Let Y1, Y2, . . . , Y,, be a random sample of size n from a normal distribution havingmean
µ and variance u2• What is the smallest value of n for which
Hint: Use a trial-and-error method.
7.5.7. Start with the fact that (n - l)S2 /a 2 has a chi square distribution with n - 1 df (if the Y,s are normally distributed) and derive the confidence inter//al formulas given in Theorem 7.5.l.
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