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[6/8] A random sample of 85 supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was

[6/8] A random sample of 85 supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for the population mean? 100% 6.49 and 7.49 0% 4.15 and 7.15 0% 6.14 and 6.86 0% 6.99 and 7.99 1:04 PM

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