what is the relationship between precision and accuracy?

The extent upto which an observed value agrees with the true value of a quantity is known as accuracy.

The precision of an observed value tells us the resolution to which the quantity is measured. The measured values which are very close to each other are precise values.

 

Precision reflects how reproducible the measurements are and the number of significant digits to which a value has been reliably measured.Or in simple terms it can be said as the closeness of two or more measurements to each other.

Precision depends on the random errors.Larger is the number of significant figures ,higher the precision.Thus precision gives the indication of number of significant figures in a measurement.

Accuracy refers to the closeness of a measured value to a standard or known value.

If the measurements for a given substance are far from each other but close to the known value, then we can say that we have accuracy without precision.