Question

A CI is desired for the true average stray-load loss μ (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 stray-load loss is normally distributed with σ=3

(a)    Compute a 90% CI for μμ when n=60 and x¯=60

≤μ≤

(b)    Compute a 95% CI for μ when n=70 and x¯=54.4

≤μ≤

(c)    Compute a 95% CI for μ when n=70 and x¯=47.9

≤μ≤

(d)    Compute a 90% CI for μ when n=55 and x¯=45.1

≤μ≤

Answer 1

(a)

(b)

(c)

(d)