Before revision: In the context of observations made on a ratio or interval scale, and given a statistical sample, the sample can be said to be accurate if its average is close to the true value of the quantity being measured and precise if its standard deviation is small.
After revision: In the context of observations made on a ratio or interval scale, a statistical sample can be said to be accurate if its average is close to the true value of the quantity being measured and precise if its standard deviation is small.