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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
nd
Special Issue of 2 International Congress of Engineering
METHODOLOGY 3. Validation of preliminary samples. At this stage
it was validated if six preliminary samples were
The study had seven stages, Figure 1 shows an more than sufficient for the study. Both the
example of the phases. conductivity and density samples were validated,
the formula used was as follows:
  2
1. Conceptualización del tema n   Z * 
  e 2  
2. Toma de muestras preliminares
Where:
n: number of samples needed for the study.
3. Válidación de las muestras preliminares.
Z: value corresponding to the gauss distribution,
for the investigation Z = 95%, which is equal to
4. Cálculo del análisis de regresión. 1.96.
 : standard deviation of the preliminary sample.
5. Análisis de resultados. i: error expected to be committed in the study. The
error is set to integer.
6. Conclusiones.
Very important, if the result of the formula is

7. Recomendaciones. smaller than the size of the preliminary sample,
the study is considered good or sufficient.
Otherwise, if the number of the formula is greater
Figure 1. Example of methodological steps than the size of the preliminary sample, the study

is not suffering, which means that samples are
1. Conceptualization of the theme. At this stage a missing to perform for the study to be complete.
bibliographic review of the topic was carried out.

2. Preliminary sampling. In this phase the problem The development of the formula for conductivity
proposed by Dr. Grunenfelder (2017) was taken is as follows:
into account, where 6 important samples of the
process were taken in the identification of a 2 2
suitable substitute for biodegradable materials in n   . 1  96 * . 0 0043    . 0  0084   . 0 ( 0016 )  . 0 000002  1
2
the fast food packaging industry. Six samples of  5   5 
the conductivity and 6 samples of the density were
taken.
The study noted that using 95% reliability, a

permissible error 5 and a standard deviation of
Table 1. Example of the samples taken for the 0.0043, will require 0.000002 samples, if this
preliminary study. number is rounded to the largest integer, it would
be a sample. Which means that with a preliminary
Conductivity Density sample is more than enough, the preliminary study
was performed six samples, which means that
0.048 0.175 these six preliminary samples are sufficient. For

0.0525 0.22 the case of density, the result of the formula was
0.00017. In the same way, it is rounded to the
0.054 0.225 largest integer, giving a result of 1 sample.
Preliminary study was performed six samples,
0.0535 0.226
which means that those with the six samples is
0.057 0.25 sufficient for the study.

0.061 0.2765

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