[Step-by-Step] A sample of 400 people getting a tax refund showed the mean to be $900 and standard deviation to be $200. Design a 99 percent confidence
Question:
A sample of 400 people getting a tax refund showed the mean to be $900 and standard deviation to be $200.
- Design a 99 percent confidence interval.
- How large a sample do you need if you want the error to be no more than $10?
Deliverable: Word Document 
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