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March 7, 2015

March 7, 2015

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.

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