NUMBAT OER - Open Educational Resources

2.3 Imprecise but accurate

The opposite situation may occur. If the sample measurements are very variable, the average will be imprecise. However, the sample average may be very close to the population average, in which case the sample average is an accurate measure of the population average. On our dartboard, the darts have landed over a wide area, but the average of their positions is close to the bullseye:

Dart board: imprecise but accurate