Posted by **Hope** on Tuesday, October 4, 2011 at 7:30pm.

If someone gives you a sample mean and a standard deviation, you can find a confidence interval. But what if someone gives you the confidence interval instead and asks you to find the sample mean? How can you do that? Here's an example: a 95% confidence interval for a mean is 9.5 to 12.5. What is the sample mean?

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