Posted by **Joe** on Tuesday, April 27, 2010 at 2:01pm.

The mean of a sample of 25 was calculated as xbar = 500. The sample was randomly drawn from a population whose standard deviation is 15. Estimate the population mean with 99% confidence.

B.) Repeat part (a) changing the population standard deviation to 30.

C.) Repeat part (a) changing the population standard deviation to 60.

D.) Describe what happens to the confidence interval estimate when the standard deviation is increased.

## Answer This Question

## Related Questions

- statistics - what are the mean and standard deviation of a sampling distribution...
- statistics - A statistics practitioner would like to estimate a population mean ...
- Statistics - Calculate the following: a) Determine the sample size necessary to ...
- statistics - Use the given information to find the minimum sample size required ...
- statistics - Use the given information to find the minimum sample size required ...
- statistics - a.a statistics practitioner randomly sampled 100 observations from ...
- Stats - A sample of 400 items is taken from a population whose standard ...
- stat - Forty-nine items are randomly selected from a population of 500 items. ...
- statistics - A simple random sample of 60 items resulted in a sample mean of 80...
- statistics - a. A random sample of 25 was drawn from a normal distribution with ...

More Related Questions