nullHow to prepare a quality control chart ?How to prepare a quality control chart ?null A quality control chart is a vieual representation of confidence of intervais for a Gaussian distribution .It warns us when a monitiored property strays dengerously far from an intended target value . A control chart can show the relative deviation of calibration check samples or quality control samples from their known value.It can also display the precision of replicate analyses of unknoens or standards as a function of time.The criteria of a control chart is as following:The criteria of a control chart is as following: 1 obesrvation outside the action lines
2 out of 3 consecutive measurements between warning and action lines
7 consecuitive measurements all above the enter line
6 consecuitive measurements all increasing or decreasing ,where they are located.
14 consecuitive points alternating up and down, regardless of they are located.
An obvious nonrandom pattern.
( warning lines：±2σ/√n action lines： ±3σ/√n ）
Volatile compounds in human blood serum were measured by GC/MS.Volatile compounds in human blood serum were measured by GC/MS.nullnull（1）
Find the mean and standard deviation for the spike data and prepare a control chart.
null
x=0.84
σ=0.188
center line：0.84
warning line：x±2σ／√n = 0.891 , 0.789
action line：x±3σ／√n = 0.916, 0.764
The black line represent center line
The green line represent warming line
The red line represent action lionnullnullnull( 2 )
There are21 measurements in the warming
line and 2 measurements between the
warming line and action line.
The other 32 measurements,which are
considered to be unlikely ,are outside the
action line.
null( 3 )
The possiibility that the measurements are
between the warming line and action line is
5.45﹪.
The possiibility that the measurements are
outside the action line is 56.36﹪.
( 4 )
So it is nearly impossible for 2 consecutive
measurements to be at the warming line.
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