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supposed in accounting firm does a study to determine the time needed to complete one persons...

supposed in accounting firm does a study to determine the time needed to complete one persons tax forms it randomly surveys 80 people the sample mean is 30.2 hours there is a known standard deviation of 8.0 hours the population distribution is assumed to be normal construct a 99% confidence interval for the population mean time to complete the tax forms.
Sample mean
Error bound Margin
Population Standard Deviation
Confidence level
Lower and Upper Bound
Math   Statistics-And-Probability   
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