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 ...
- 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...
- statistics - the universal baking ic purhases bags of flour which vary somewhat ...
- Statistics - A study was conducted to investigate relationships between ...
- statistics - A sample of 25 men has a mean weight of 65kg with standard ...
- statistic - A grain mill manufactures 100-pound bags of flour for sale in ...

More Related Questions