False precision
Often false precision is abused to produce an unwarranted confidence in the claim: "our mouthwash is twice as good as our competitor's".Even outside these disciplines, there is a tendency to assume that all the non-zero digits of a number are meaningful; thus, providing excessive figures may lead the viewer to expect better precision than exists.However, in contrast, it is good practice to retain more significant figures than this in the intermediate stages of a calculation, in order to avoid accumulated rounding errors.False precision commonly arises when high-precision and low-precision data are combined, when using an electronic calculator, and in conversion of units.Measures that rely on statistical sampling, such as IQ tests, are often reported with false precision.