SAMPLE PLAN FOR SOUTH PLATTE GRAVEL

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Notes:

A two-factor sampling plan was used for South Platte gravel:

1-The plan measures effects of two factors (stratigraphy and location) on gravel quality. Labels are sample numbers.

2-Three gravel layers were sampled at three sites (pits).

3-Sampling was replicated at three sections 500 ft apart. Replicate sections measure both local variation and sampling error. Sample error was not determined separately.

4-Two-factor plans enable simultaneous analysis of variation among gravel layers and sites. If there is no interaction between factors, summaries can be prepared for layers or sites.

U.S. Department of the Interior
U.S. Geological Survey

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Last updated 07 Dec 2016