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A confidence interval is desired for the true average stray load loss µ, measured in watts...

A confidence 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 the stray load loss is normally distributed with σ = 3.0.

(a) Compute a 95% confidence interval when x¯ = 58.3 and n = 25

(b) Repeat (a) but now assume n = 100. Compare the two intervals and comment on the effect of sample size.

Math   Statistics-And-Probability   
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