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A confidence interval estimate is desired for the gain in a

A confidence interval estimate is desired for the gain in a circuit on a semiconductor device. Assume that gain is normally distributed with standard deviation σ = 30.

(a) How large must n be if the length of the 95% CI is to be not greater than 60?

(b) How large must n be if the length of the 99% CI is to be not greater than 60?

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