Food Protection Trends - July/August 2017 - 277
TABLE 8. Sample sizes for variable acceptance sampling plan using the median and
range/d2 as estimate of standard deviation
Confidence Level
Minimum percent acceptable to be demonstrated
95%
7
10
20
90%
95%
99%
99%
30
60
100+
99.5%
100+
100+
100+
Source: (7).
TABLE 9. Sample sizes for variable acceptance sampling plan using the calculated mean
and standard deviation
Confidence Level
Minimum percent acceptable to be demonstrated
95%
7
10
17
90%
95%
99%
99%
23
35
65
99.5%
54
86
100+
Source: (7).
TABLE 10. Comparison of sample sizes for attribute and variable acceptance sampling
plan using the calculated mean and standard deviation. Source: other tables
We are 95% confident of the percentage acceptable
Confidence Level
95%
99%
99.5%
Notes
Source
Infinite lot size
~
χ, range/d2
~χ, s
Table 7
Attribute
95%
59
299
593
Variable
95%
10
60
100+
Variable
95%
10
35
86
A comparison of the number of samples needed for
testing by use of the attribute and variable sampling
plans is shown in Table 10. The sample sizes listed have a
95% confidence and a reliability, or percent acceptable,
of 95%, 99% and 99.5%. Using 99% reliability as an
example, 3 different n's are displayed: 299 for attribute
sampling, 60 from a variable plan based on the sample
median and range/d2, and 35 from a variable sampling
plan based on the sample mean and standard deviation.
At this confidence and reliability level, there is more than
an 8-fold difference in sample size between the largest
attribute and smallest variable sampling level.
Table 8
Table 9
Core temperature data normality test results
The grouped data from different-sized fish with different
temperature distributions were standardized and combined
for analysis. The data are plotted on a histogram (frequency
distribution), as shown in Fig. 2, or normal probability plot,
as shown in Fig. 3. With a Ryan-Joiner statistic of P > 0.05,
the data distribution can be assumed to be normal or nearnormal (7).
The data from the 296 data sets of 24 core temperatures
each were tested for normality. The Ryan-Joiner test rejected normality in six of the 296 precooks, when tested at the
95% confidence level. No significant departure was detect-
July/August Food Protection Trends
277
Table of Contents for the Digital Edition of Food Protection Trends - July/August 2017
Contents
Food Protection Trends - July/August 2017 - Cover1
Food Protection Trends - July/August 2017 - Cover2
Food Protection Trends - July/August 2017 - Contents
Food Protection Trends - July/August 2017 - 234
Food Protection Trends - July/August 2017 - 235
Food Protection Trends - July/August 2017 - 236
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Food Protection Trends - July/August 2017 - 277
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Food Protection Trends - July/August 2017 - 308
Food Protection Trends - July/August 2017 - Cover3
Food Protection Trends - July/August 2017 - Cover4
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