Saturday

October 25, 2014

October 25, 2014

Posted by **Jana** on Monday, December 20, 2010 at 2:14pm.

- statistics -
**TutorCat**, Tuesday, December 21, 2010 at 2:23amcalculate the z scores:

z= (x-xbar)/(σ/sqrt(n))

where xbar=sample mean, σ=standard deviation of population, n=sample size, x=raw score (i.e. 98, 100)

now refer to the z chart:

http://www.thebeststatistics.info/sta/table_zvals.html

since you want the probability that the mean is between 98 and 100 months, I'd use the p-values on the right column (i.e. z-score to infinity) and take the difference of the p-values to get the area between 98 and 100.

**Answer this Question**

**Related Questions**

statistics - The average age of a vehicle registered in the United States is 8 ...

stat. - The average age of a vehicle registered in the United States is 8 years...

Stats. - The average age of a vehicle registered in the United States is 8 years...

Statistics - The average age of vehicles registered in the united states is 96 ...

statistics - The average age of a child in kindergarden is 5 years or 60 months...

statistics - The average age of statistics students nationwide is 22. The ...

Statistics - The average age of chemical engineers is 37 years with a standard ...

probability and statistics - the average age for licensed drivers in the country...

stats - 2. The average age of a child in kindergarten is 66 months. The standard...

statistics - The average age for licensed drivers in the county is μ 40.3...