Posted by **Prakash** on Thursday, October 6, 2011 at 2:08pm.

A 90% confidence interval for a population mean based on 144 observations is computed to be (2.7,3.4). How many observations must be made so that 90% confidence interval will specify the mean to within ± 0.2

- statistics -
**cikdi**, Friday, October 7, 2011 at 10:43pm
n=140

## Answer this Question

## Related Questions

- 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 - A 95% confidence interval for a population mean, ?, is given as (18...
- Statistics - A random sample of 90 observations produced a mean that = 25.9 and...
- Statistics - Suppose x has a mound-shaped distribution with sigma = 9 . A random...
- statistics - What do confidence intervals represent? What is the most ...
- Statistics - A confidence interval for a population mean has a margin of error ...
- Statistics - Multiple Choice Which of the following statements is true about the...
- Statistics - Which of the following statements best describes the uncertainty ...

More Related Questions