What type of sample is desired when sampling for testing?

When sampling for testing, it is essential to obtain representative samples. A representative sample accurately reflects the characteristics and properties of the entire batch or population from which it is drawn. This ensures that the results of any tests conducted on the sample can be generalized to the larger group, leading to valid and reliable conclusions about that group.

The importance of using representative samples lies in their ability to minimize bias and variability that could affect test outcomes. For example, if a sample is skewed by location, timing, or methods of collection, the analysis might not represent the true conditions or quality of the broader material or environment being sampled.

In practice, using representative samples allows for more effective decision-making based on testing results, which is crucial in fields such as earthwork, where materials and soil samples must meet specific standards for construction and engineering projects. Sampling strategies must be carefully designed to ensure that the samples collected will provide a true picture of the entire population under investigation.