tutashirts.blogg.se - Error of your ways

While measuring devices strive for complete accuracy, they may not yield entirely accurate results. Other times, errors in the chemistry lab result from instrumental limitations. For instance, several chemists might get different answers when measuring a piece of rope or rubber band if they do not know what the tension is supposed to be. For example, when reading a ruler you may read the length of a pencil as being 11.4 centimeters (cm), while your friend may read it as 11.3 cm.Some errors in the chemistry lab result from an unclear definition or expectation of what the experiment is supposed to record.

Estimation error can occur when reading measurements on some instruments.

Examples of this are when a phone number is copied incorrectly or when a number is skipped when typing data into a computer program from a data sheet.

Transcriptional error occurs when data is recorded or written down incorrectly.

Two types of human error are transcriptional error and estimation error.

Human error is due to carelessness or to the limitations of human ability.

If two people are rounding, and one rounds down and the other rounds up, this is procedural error.

Procedural error occurs when different procedures are used to answer the same question and provide slightly different answers.

For example, if you are trying to measure the mass of an apple on a scale, and your classroom is windy, the wind may cause the scale to read incorrectly.

Environmental error happens when some factor in the environment, such as an uncommon event, leads to error.

A pH meter that reads 0.5 off or a calculator that rounds incorrectly would be sources of instrument error.

Instrumental error happens when the instruments being used are inaccurate, such as a balance that does not work (SF Fig.