Posted by **Anonymous** on Friday, July 16, 2010 at 2:53pm.

1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the sample mean

- statistics -
**PsyDAG**, Saturday, July 17, 2010 at 11:04am
95% interval = mean ± 1.96 SEm

SEm = SD/√(n-1), but you can just use n

I hope this helps.

- statistics -
**John**, Saturday, December 4, 2010 at 5:55pm
45.35 to 48.65

- statistics -
**John**, Saturday, December 4, 2010 at 5:56pm
(z test interval) =45.35 to 48.65

## Answer this Question

## Related Questions

- statistics - A random sample of size 81 is taken from a large population, ...
- statistics - 1. A random sample of size 49 is taken from a large population, ...
- statistics - A random sample of size 49 is taken from a large population, ...
- Statistics - . A random sample is selected from a normal population with a mean ...
- statistics - A simple random sample of a size n is drawn from a population that ...
- business statistics - A random sample of size 15 taken from a normally ...
- statistics - The times taken to complete a statistics test by all students are ...
- statistics - The times taken to complete a statistics test by all students are ...
- Statistics - You are getting ready to take a sample from a large population, and...
- statistics - The scores of students on the ACT college entrance examination in ...