NUMBAT OER - Open Educational Resources

2.2 Precise but inaccurate

In our everyday use of the words, this expression seems paradoxical. However, using the definitions in the previous section, we can understand that a sample can be precise where there is little variability around the average value, but is inaccurate because the sample average is different from the population average. Again, using the dartboard analogy, darts land in a tight cluster but they are far from the bullseye:

Dart board: precise but inaccurate