Posted by **Mike** on Monday, June 18, 2012 at 10:54pm.

A 95% confidence interval for a population mean, ?, is given as (18.985, 21.015). This confidence interval is based on a simple random sample of 36 observations. Calculate the sample mean, x ?, and the sample standard deviation, s. Assume that all assumptions and conditions necessary for inference are satisfied.

- Statistics -
**MathGuru**, Tuesday, June 19, 2012 at 6:37pm
95% confidence is two standard deviations about the mean.

Add 18.985 and 21.015 together, then divide by 2. This will be your mean.

Subtract 18.985 from the mean, then divide that result by 2. This will be your standard deviation.

## Answer This Question

## Related Questions

- statistics - A simple random sample of 60 items resulted in a sample mean of 80...
- Statistics (42) - A simple random sample of 60 items resulted in a sample mean ...
- statistics - Consider a 95% confidence interval for a population mean ...
- statistics - Consider a 95% confidence interval for a population mean ...
- Statistics - The standard deviation for a population is σ = 15.3. A sample ...
- Statistics - Suppose x has a mound-shaped distribution with sigma = 9 . A random...
- Statistics 101 - A researcher plans to use a random sample of n= 500 families to...
- Statistics - Which of the following statements correctly interprets a 95% ...
- Economics (41) - A simple random sample of 60 items resulted in a sample mean of...
- Statistics - These are the only ones that I am having problems with. Please help...

More Related Questions