Posted by **steven** on Tuesday, April 20, 2010 at 3:58pm.

we developed a 95% z confidence interval for the mean BMI of women aged 20 to 29 years, based on a national random sample of 654 such women. we assumed there that the population standard deviation was known to be 7.5. in fact the sample data had mean BMI of 26.8 and standard deviation s=7.42. what is the 95%t confidence intervalfor the mean BMI of all young women?

- statistics -
**MathGuru**, Tuesday, April 20, 2010 at 7:27pm
CI95 = mean + or - 1.96(sd divided by √n)

...where + or - 1.96 represents the 95% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.

Substitute the values into the formula and calculate the interval.

## Answer this Question

## Related Questions

- Statistics - A 95% confidence interval for a population mean, ?, is given as (18...
- statistics - A simple random sample of 60 items resulted in a sample mean of 80...
- Statistics - An April 15, 2002 report in Time Magazine stated that the average ...
- Statistics 101 - A researcher plans to use a random sample of n= 500 families to...
- Statistics (42) - A simple random sample of 60 items resulted in a sample mean ...
- statistics - The U.S. Geological Survey compiled historical data about Old ...
- Statistics - An April 15, 2002 report in Time Magazine stated that the average ...
- statistics - An April 15, 2002 report in Time Magazine stated that the average ...
- statistics - An April 15, 2002 report in Time Magazine stated that the average ...
- STATISTICS - An April 15, 2002 report in Time Magazine stated that the average ...