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Theresistance(inOhms)ofacertaintypeofresistor(anelectronicdevice)followsanormal distribution with mean and standard deviation . A technician randomly selected 25 resistors; the mean resistance was x = 971 with standard deviation s

Theresistance(inOhms)ofacertaintypeofresistor(anelectronicdevice)followsanormal distribution with mean and standard deviation . A technician randomly selected 25 resistors; the mean resistance was x = 971 with standard deviation s = 68.

(a) Find a 95% confidence interval for . Statistics for Business, University of Iowa, 2021 Matt Bognar

7.5 Exercises

137

(b) (c) (d) (e) (f)

Based upon your answer in 7.15(a), does the mean resistance significantly differ from 1,000? Why?

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