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What is a Youden Plot?
graphical technique to determine withinlab and between lab variability.

How many standard deviations are drawn around the origin of a youden plot?
3

How many samples are each lab given?
2  ea w similar but not equal conc of analytes. first result is (x) and second is (y)

the 45 degree reference line is drawn to measure...?
systematic and random error

Systematic error?
distance of ea point from the origin. values that accumulate in upper right or lower left

random error?
distance of ea point from the line at 45 degrees to the origin. distributed around the mean.

is random or systematic error used to calculate the radius of the circle?
random.

To avoid errors when making a Youden plot...?
 use same matrix
 similar std dev. and conc.
 same method
 same level of precision

What is a Shewhart Chart?
 graphical analysis of variance (ANOVA)
 used to;
  determine acceptable levels of quality
  achieve these levels & maintain performance

what % of values should lie inbetween the follwing deviations, respectively. mean  1, 23, near control limits
 mean  1; 68%
 2  3; 28%
 near control limits 2%

The shewhart chart is evaluated on the basis of...?
 Spread  inspect R chart to obs process varia
 Position  data pts equally distributed around mean, should not exceed control limits

variability is dependent on?
  # of samples
  frequency of samples
  size of sample

degradation of sorbent in GC would be special or common cause?
special cause

