Posted by **Ann** on Sunday, July 22, 2012 at 6:52pm.

The confidence interval below for the population variance is based on the following sample statistics: n = 25, x-bar = 31.1, and s = 4.2.

9.29 < standard deviation squared < 42.82

What is the degree of confidence?

- Statistics -
**MathGuru**, Monday, July 23, 2012 at 6:41pm
99% is the degree of confidence.

To check:

Use 2.58 to represent 99%. Find the formula for the confidence interval using standard deviation. Remember that standard deviation is the square root of the variance. Substitute what you know into the formula from the information given to check.

- Statistics -
**Ann**, Monday, July 23, 2012 at 7:55pm
I know the formula. How do you work backwards?

## Answer This Question

## Related Questions

- Statistics - Which of the following statements correctly interprets a 95% ...
- Statistics - The standard deviation for a population is σ = 15.3. A sample ...
- Statistics - A 95% confidence interval for a population mean, ?, is given as (18...
- statistics - The Frayed Nerves Anxiety Scale (FNAS) is used to measure the ...
- Statistics - The grades in the final exam of a random sample of 25 students ...
- statistics - The data below are the ages of a random sample of 8 men in a bar. ...
- Math Statistics - 5. Students in an introductory statistics class were asked to ...
- Statistics - What is the appropriate sample size for a confidence interval ...
- statistics - A psychologist wants to estimate the variance of employee test ...
- statistics - A simple random sample of 60 items resulted in a sample mean of 80...

More Related Questions