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A company is checking in the second part of the year the behaviour of the sample proportion p of defective items. The operator takes not
A company is checking in the second part of the year the behaviour of the sample proportion p of defective items. The operator takes not of the items requiring rework and the total weekly production over weeks from week to
Week
Subgroup no
Requiring rework
Total production
Proportion p
x
x
to be calculated
y
y
to be calculated
z
z
to be calculated
t
t
to be calculated
x
y
to be calculated
Note: please substitute the letters xyz and t with:
x the second number of your student ID
y the third number of your student ID
z the fourth number of your student ID
t the fifth number of your student ID
So should your student ID be: :
x
y
z
t
You are requested to:
Fill out the table with the remaining values of sample proportion based on your specific student ID;
Choose the correct SPC chart to represent the problem;
Calculate UCL and LCL for the relevant charts;
Comment on the overall process and on specific samples.
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