Mixed Analyte Performance Evaluation Program

Statistical Summary

 Sample Id:  MAPEP-95-W3

         Laboratories Receiving Samples: 73

           Number Labs Sample   Grand     Grand       Mean %    Range    Range
Analyte     Reporting   Size     Mean     Std Dev     Bias      Min       Max
Arsenic       43         42      2.65      0.22       6.12      1.93      3.22
Barium        43         41     41.47      2.26       4.14     33.03     46.58
Cadmium       44         44      0.58      0.03       4.50      0.44      0.65
Chromium      44         44      2.26      0.13       3.95      1.73      2.57
Lead          44         44      2.14      0.12       5.09      1.53      2.44
Selenium      43         41      0.50      0.06       8.06      0.38      0.65
Americium-241 41         37      1.29      0.14       8.11      0.98      1.69
Cesium-137    48         48     55.70      2.99       6.14     50.07     63.89
Cobalt-57     47         44     91.49      8.49       6.55     68.40    104.93
Manganese-54  47         47     99.72      9.54       6.29     74.47    116.48
Plutonium-238 44         40      1.81      0.16       7.29      1.45      2.26
Plutonium-239 47         44      1.35      0.12       7.67      0.97      1.65
Strontium-90  39         36     15.41      1.72       8.94     11.23     18.63
Uranium-234   44         42      0.64      0.06       7.10      0.52      0.77
Uranium-238   46         43      0.64      0.05       6.79      0.56      0.83

Sample size excludes outliers.
Outliers are defined as laboratory means with a bias greater than 30 percent.
Range minimum and maximum values refer to the laboratory means.

Final Reports were mailed to Participants the week of April 22nd.

05/02/96                               Page 1