what is accuracy and precision ? with example.
What is ACCURACY And PRECISION ? ACCURACY : accuracy is the closeness between the measured value and accepted or true value of the measured quantity. The accurate value of the sample can be determined by averaging the precise value. Eg : in a organic sample the percentage of carbon 49. 50 by the analysis off two analyst are as follows :- A --49. 40, 49. 47, 49.53, 49.64 Mean = 49.51 B -- 49.01, 49.03, 49.03, 49.04 Mean = 49.03 Therefore , A is more accurate than B. WHAT IS ERROR AND ITS DIFFERENT TYPES (in chemistry) PRECISION : the agreement between a set of result made on same sample in an identical manner is known as precision of the measurement i.e., precision reflects the closeness among the replicate measurement of the same quantity. Eg : In an organic compound two analyst analysis as follows :- A -- 49.40, 49.47, 49...