(Step-by-Step) A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8.
Question: A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8. What is the 90% confidence interval for the average days worked?
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![[All Steps] A previous study of nickels](/images/solutions/MC-solution-library-44140.jpg "[All Steps] A previous study of nickels showed that the standard")
[All Steps] A previous study of nickels showed that the standard
(See Steps) A survey of 800 women shoppers found that 17% of them
![[Solved] What is the 90% confidence interval](/images/solutions/MC-solution-library-44142.jpg "[Solved] What is the 90% confidence interval for the variance of")
[Solved] What is the 90% confidence interval for the variance of
![[Steps Shown] If the equation of the](/images/solutions/MC-solution-library-44143.jpg "[Steps Shown] If the equation of the regression line is y=-4x+7,")
[Steps Shown] If the equation of the regression line is y=-4x+7,
(See Solution) The equation of a regression line is y=4.6+3.2x,
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