10). A sample of 35 different payroll departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days, find the 90% confidence interval for the average number of days worked by all employees who are paid through payroll

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**Problem 10: Confidence Interval Calculation**

A sample of 35 different payroll departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days, calculate the 90% confidence interval for the average number of days worked by all employees who are paid through payroll departments. 

**Instructions:**
- Be sure to show your formulas and all of your work.
- Round your final answer(s) to one decimal point.

**Note:**
- The prompt does not include any graphs or diagrams for explanation.
Transcribed Image Text:**Problem 10: Confidence Interval Calculation** A sample of 35 different payroll departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days, calculate the 90% confidence interval for the average number of days worked by all employees who are paid through payroll departments. **Instructions:** - Be sure to show your formulas and all of your work. - Round your final answer(s) to one decimal point. **Note:** - The prompt does not include any graphs or diagrams for explanation.
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