Posted by Adam on .
A statistics practitioner formulated the following hypothesis:
Ho: population mean=200
H1: population mean<200
sample mean=190
n=9
population standard deviation=50
Calculate the pvalue of the test

statistics 
MathGuru,
Use the ztest 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 pvalue using a ztable. The pvalue is the actual level of the test statistic.
I hope this will help get you started.