Posted by **natasha** on Saturday, December 4, 2010 at 4:48pm.

the mean of adult men is 172 pounds with a standard deviation of 29 pounds. ask 20 men thier weight and use excel to calculate the mean. test the hypothesis that the mean is not 172 pounds at the .10 significance level. and how many men should be sampled if you want to be 98% confident that the mean will be within an error of 3lbs.

- statistic -
**PsyDAG**, Sunday, December 5, 2010 at 11:59am
We have no access to your sample data.

Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to your Z score.

Remember that:

Ho: mean = 172

Ha: mean ≠ 172

## Answer This Question

## Related Questions

- Stat - the mean of adult men is 172 pounds with a standard deviation of 29 ...
- Math - Use the normal distribution of weights of adult men, which has a mean of...
- Statistics - Assume the weights of men are normally distributed having a mean of...
- STAT - The mean weight of all 20-year old women is 130 pounds. A random sample ...
- Algebra (Normal Distribution) - The weights of 1,000 men in a certain town ...
- Stats - National Packing Materials Company claims its X20 box can hold loads up ...
- statistics - The weight of 14 healthy newborn children was measured. The sample...
- math - Weights of women are normally distributed with mean 143 pounds and ...
- statistics - the weights of shells follow a normal distribution. a random sample...
- STAT - The weights of the 100 students in an introductory statistics class are ...

More Related Questions