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January 31, 2015

January 31, 2015

Posted by **Anand** on Monday, October 17, 2011 at 7:10pm.

1. What is x bar?

2. What is the standard deviation of the mean?

3. What is the 95% confidence interval for x bar?

4. What is the 99% confidence interval for x bar?

5. How many students do you need to survey to get the plus or minus for the 95% confidence interval down to 20?

6. How about for the 99% confidence interval?

- statistics -
**PsyDAG**, Tuesday, October 18, 2011 at 12:15pm_

1. x = ∑x/n

2. SEm = SD/√n

_

3. x ± 1.96 SEm

I'll leave the rest up to you.

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