What is a composite sample?

What is a composite sample?

• A. A collection of several samples from different locations
• B. A random selection of items for analysis
• C. A single sample made up of individual sub samples
• D. A sample used only for training and verification

Answer: (C)

A composite sample is created by combining several smaller subsamples into one analytical sample. This yields a single result that represents the average condition across those subsamples, rather than a separate result for each spot. In lead inspection, you might take small pieces from multiple spots on a surface and mix them to form one composite sample for lab analysis. This is why the description of “a single sample made up of individual sub samples” is the correct choice. The other ideas describe sampling multiple locations for separate results, randomly selecting items, or using a sample only for training, none of which capture the idea of merging subsamples into one measured sample.

A composite sample is created by combining several smaller subsamples into one analytical sample. This yields a single result that represents the average condition across those subsamples, rather than a separate result for each spot. In lead inspection, you might take small pieces from multiple spots on a surface and mix them to form one composite sample for lab analysis. This is why the description of “a single sample made up of individual sub samples” is the correct choice. The other ideas describe sampling multiple locations for separate results, randomly selecting items, or using a sample only for training, none of which capture the idea of merging subsamples into one measured sample.