Posted by Adam on Friday, March 19, 2010 at 7:15am.
Use the z-test formula to find the test statistic since you know the population standard deviation:
z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size)
With the data given in the problem:
z = (190 - 200)/(50/√9)
Finish the calculation and determine the p-value using a z-table. The p-value is the actual level of the test statistic.
I hope this will help get you started.
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