NUMBAT OER - Open Educational Resources

2.1 Precise and accurate

The average value from a sample is precise if the sample as a whole has low variability. It is an accurate representation of the parent population if this average is very close to the 'real' average for the population. If we use a dartboard as an analogy, darts (sample measurements) all land close to the bullseye of the dartboard (representing the population mean):

Dart board: precise and accurate