True or False: There are instances where differences between test samples cannot be avoided.

The assertion that there are instances where differences between test samples cannot be avoided is true. In various testing scenarios, numerous factors contribute to variability in test samples, and these discrepancies can arise due to natural material variability, environmental conditions, sample handling procedures, or even equipment calibration issues. Aggregate materials, for instance, may differ in size, shape, moisture content, and composition, all of which can lead to variations in test results.

Even when following standardized procedures, inherent characteristics of materials or external influences may yield different outcomes across multiple samples. For example, if samples are taken from different locations within an aggregate source, the geological differences may result in variations in density or grading, which cannot be controlled or predicted perfectly.

Recognizing that such variations can exist is crucial for interpreting test results and understanding their implications for construction practices and material performance. Proper quality control measures can mitigate some differences, but they cannot entirely eliminate variability in certain conditions, affirming that there are indeed instances where differences in test samples cannot be avoided.