To protect public health following a wide-area chemical, biological (pathogen and/or biotoxin), or radiological (CBR) contamination incident, environmental sampling and analysis results are used to ...

The bootstrap can be used to assess uncertainty of sample estimates. We have previously discussed the importance of estimating uncertainty in our measurements and incorporating it into data analysis 1 ...

What Is the Central Limit Theorem? The Central Limit Theorem (CLT) states that if you sample a data population enough times, then the means and standard deviations of the samples will approach a ...

What is Particle Size Distribution Analysis? To determine the size and range of particles in a specific material, particle size distribution (PSD) analysis is used. Several techniques are used to ...

When particles in a sample are the same size, one particle can be measured to report the result. If the sample has a narrow distribution, such as 10-25 µm, then measurement of just a few particles can ...