Question

Explain the difference between accuracy and precision. What is the difference between absolute vs. relative uncertainty? What are the equations commonly used to calculate these terms?

Answer 1

Qlo Difference blu accuracy and precision Accuracy is the closures d aguurnent blw a measured, Value and the true value 0 Precision is the closeness of agrement blw independent measurements of a quantity under the same condition It 7 is a measure of how will a measurement can be made without reference to a moretical or true value 02. Difference blw awolute vs. relatuie weertainity Absolute Uncentainity - we absolute uncertainity is the number which , when combined with a reported value, gives the range of true values. For instance, a length may be reported as 7.3 mm 1 0.2mm. Here, the reported valine is 7.3 mm a abys olid value is 0.2 mmthe range of true values is 7.1 mm to 7.5 mm. Abscute uncertainties always have the same units as the reported value will nobrich that are associated Relative Uncertainity - the relative uncertainity is the ratio of the absolute uncertainity to the reported valus. A length of 100 um Il tras a relative uncertainity of 1 cm /100 cm , or I part per hundered (= 1% or Ipph) . Relative uncertainities are always emitless 3. equation commonly used to calculate relatwe uncertainly is :- relature uncertainity = absolute error equation for absolute uncertainity a - measured value . Absolute uncertainity - Actual Value - Mecawred value