Processing kodak motion picture films, module 3 analytical procedures

VISUAL TITRATION STATISTICS
Repeatability Standard Deviation, 1s r and
95 Percent Confidence Estimate
Repeatability Standard Deviation is an estimate of the
variability one trained analyst should be able to obtain under
favorable conditions (analyzing a sample, with one
instrument, within one day).
The 95 percent Confidence Estimate (calculated using the
repeatability standard deviation) around a single test will
include the mean value 95 percent of the time.
Samples
(Process
ECN-2 Dev)
“Fresh” at
“Aim”
(4.008 g/L
CD-3)
“Seasoned”,
As
Received
“Seasoned”
with
Standard
Addition
Mean
Level
(g/L CD-3)
CD-3 (Visually)
(N)
Repeatability
Standard
Deviation, 1S r
(g/L CD-3)
95 Percent
Confidence
Estimate
(g/L CD-3)
3.879 5 0.045 ± 0.012
2.250 5 0.020 ± 0.056
3.206 5 0.021 ± 0.058
Bias
Bias is a statistically significant deviation from the known
mix level at a 95 percent confidence level. It is determined
for fresh samples only. Bias is not determined for seasoned
samples, since the component concentration level was not
determined independent of the test method.
A statistically significant low bias for CD-2 (of –3.1
percent) was found for a fresh tank Process ECN-2
developer sample. However, the bias for was judged not to
be practically significant.
Recovery
Recovery is used instead of bias for seasoned samples, since
the component concentration level was not determined
independently of the test method. It is defined as the
calculated mean for the seasoned sample with a standard
addition of the component minus the mean for the seasoned
sample, divided by the actual amount of the standard
addition. It is expressed as a percentage. The recovery of
85.6 percent is statistically different from 100 percent.
However, this was judged not to be practically significant.
Reproducibility
Customer Standard Deviation, 1s c & 95 Percent
Confidence Estimate (not including bias)
The customer standard deviation (1s c ) is an estimate of the
variability a customer could expect when submitting a
sample to any Photoprocessing Quality Services laboratory,
where any trained analyst could test the sample using any
instrument on any day.
The 95 percent confidence estimate (calculated using the
customer standard deviation) around a single test result will
include the mean value 95 percent of the time.
Samples
(Process
ECN-2 Dev)
“Fresh” at
“Aim”
(4.008 g/L
CD-3)
“Seasoned”,
As
Received
“Seasoned”
with
Standard
Addition
Mean
Level
(g/L CD-3)
CD-3 (Visually)
Bias
Bias is a statistically significant deviation from the known
mix level at a 95 percent confidence level. It is determined
for fresh samples only. Bias is not determined for seasoned
samples, since the component concentration level was not
determined independent of the test method.
A statistically significant low bias for CD-2 (of –4.4
percent) was found for a fresh tank Process ECN-2
developer sample. However, the bias for was judged not to
be practically significant.
Recovery
Recovery is used instead of bias for seasoned samples, since
the component concentration level was not determined
independently of the test method. It is defined as the
calculated mean for the seasoned sample with a standard
addition of the component minus the mean for the seasoned
sample, divided by the actual amount of the standard
addition. It is expressed as a percentage. The recovery of
93.8 percent is statistically different from 100 percent.
However, this was judged not to be practically significant.
Processing KODAK Motion Picture Films, Module 3, Analytical Procedures H24.03 3
(N)
Reproducibility
Standard
Deviation, 1S c
(g/L CD-3)
95 Percent
Confidence
Estimate
(g/L CD-3)
3.833 16 0.031 ± 0.066
3.727 16 0.039 ± 0.084
4.787 16 0.032 ± 0.067