A CI is desired for the true average stray load loss (watts) for a ce...

A CI is desired for the true average stray-load loss Î¼ (watts) for a certain type...

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A CI is desired for the true average stray-load loss Î¼(watts) for a certain type of induction motor when the line currentis held at 10 amps for a speed of 1500 rpm. Assume that stray-loadloss is normally distributed with Ïƒ = 2.2. (Round youranswers to two decimal places.)
(a) Compute a 95% CI for Î¼ when n = 25 andx = 54.9
(Â Â Â Â Â Â Â Â ,Â Â Â Â Â Â Â Â )watts

(b) Compute a 95% CI for Î¼ when n = 100 andx = 54.9.
(Â Â Â Â ,Â Â Â Â Â Â ) watts

(c) Compute a 99% CI for Î¼ when n = 100 andx = 54.9.
(Â Â Â Â Â Â Â Â ,Â Â Â Â Â Â )watts

(d) Compute an 82% CI for Î¼ when n = 100 andx = 54.9.
(Â Â Â Â ,Â Â Â Â )watts

(e) How large must n be if the width of the 99% intervalfor Î¼ is to be 1.0? (Round your answer up to the nearestwhole number.)
n =

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3.8 Ratings (352 Votes)

a sample mean xbar 549 sample standard deviation 22 sample size n 25 Given CI level is 95 hence 1 095 005 2 0052 0025 Zc Z2 196 ME zc sqrtn ME 196 22sqrt25 ME 086 CI xbar Zc ssqrtn xbar Zc ssqrtn CI 549 196 22sqrt25 549 196 22sqrt25 CI 5404 5576 b sample mean xbar 549 sample standard deviation See Answer

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