6. -9 points DevoreStat9 7.E.004 My Notes Ask Your Teacher A CI is desired for t

Question

6. -9 points DevoreStat9 7.E.004 My Notes Ask Your Teacher A CI is desired for the true average stray-load loss (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 : 2.1. (Round your answers to two decimal places.) (a) Compute a 95% CI for when n 25 and x = 52.9. watts (b) Compute a 95% CI for when n = 100 and x = 52.9 watts (c) Compute a 99% CI for when n = 100 and x = 52.9. watts (d) Compute an 82% CI for when n = 100 and x = 52.9. watts (e) How large must n be if the width of the 99% interval for is to be 1.07(Round your answer up to the nearest whole number.) n= You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It Talk to a Tutor Submit Answer Save Progress Practice Another Version

Explanation / Answer

Sol:

Use TI 83 cal

STAT--->TESTS-->Z interval

52.08,53.72

Solutionb:

52.49,53.31

Solutionc:

52.36,53.44

solutiond:

52.62,53.18

Solutione:

n=(z std/E)^2

=(2.576*2.1/1)^2

=29.26

n=29

reqd sample size=29

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