Nearly the same optimized results were obtained using both methods: sample size, 5 mL; volume of NaOH 10 M, 2 mL; chloroform volume, 300 μL; 8-hydroxy quinoline concentration more than 0.01 M and salt amount did not affect the extraction significantly.
Nearly the same results for optimization were obtained using both methods: sample size 5 mL; volume of dispersive solvent 1.5 mL; dispersive solvent methanol; extracting solvent chloroform; extracting solvent volume 250 μL; 8-hydroxy quinoline concentration and salt amount do not affect significantly the extraction.
This dissimilar result might be because of using different methods, sample size, climate factor, geology, soil type, dissolution of minerals from lithological composition, and addition of chemical fertilizers.
Data were recorded about the author, year of the study, sample, methods, sample size, study focus, and main findings.
The standardized questionnaire and survey methods, sample size calculation, data entry, data management, and statistical analysis methods are all described in depth in the Overview article.
Following established qualitative research methods, sample size is estimated at what will achieve saturation (ie, when new interviews cease to provide fresh information).
The study uncovers state-of-the-art approaches in research methodologies in IB in terms of five major aspects: data collection methods, sample sources including sampled countries and subjects, sampling methods, sample sizes, and response rates.
In general, because of test methods, sample sizes, and geoecological conditions, the actual discrepancy is difficult to explain in the prevalence of Cryptosporidium among different studies [ 30].
Figure 1 Histograms and fitted distributions of M-estimates residuals with different explanatory variables and M-methods (sample size is (pmb{n=1000}) ).
Figure 2 Histograms and fitted distributions of M-estimates residuals with different explanatory variables and M-methods (sample size is (pmb{n=1000}) ). Figure 3 A comparison fitted distribution functions of residuals and assumed NSD errors (sample size is (pmb{n=1000}) ).
It emphasizes representativeness of the sample with regard to the population of interest, the sampling method, sample size, participation rate, access, validation, use of diagnostic criteria and description of timeframe.
