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Examen
INDU 6331 Assignment 5 Solutions
9.1. The data in table represent individual observations on molecular weight taken hourly 
from a chemical process. 
The target value of molecular weight is 1050 and the process standard deviation is thought 
to be about σ= 25. 
a) Set up a tabular cusum for the mean of this process. Design the cusum to quickly detect a 
shift of about 1.0σ in the process mean. 
σ= 25 
μ0= 1.050 
Magnitude of shift= 1,0(25)= 25 
μ1= 1.050 + 1,0(25)= 1.075 
K = 
/μଵ − μ/ 
2 
= 
/1.075 − 1.050/ 
2 ...