Aconfidence interval is desired for the true average stray-load loss μ (measured in watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. assume that the stray-load loss is normally distributed with σ = 3.0.

(a) compute a 95% ci for μ when n = 25 and sample mean = 58.3.

(b) compute a 95% ci for μ when n = 100 and sample mean = 58.3.

(c) compute a 99% ci for μ when n = 100 and sample mean = 58.3.

(d) compute a 82% ci for μ when n = 100 and sample mean = 58.3.

(e) how large must n be if the width of the 99% ci for μ is to be 1.0?

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