Download a free book, Statistics in Biology for additional helpGo to the following link to download the Vernier Graphical Analysis program to your chromebook: How to use a pH probe: Statistical analysis
ACCURACY AND PRECISION ACCURACY Accuracy descibes the nearness of a measurement to the standard or true value, i.e., a highly accurate measuring device will provide measurements very close to the standard, true or known values.Example: in target shooting a high score indicates the nearness to the bull's eye and is a measure of the shooter's accuracy. Refer to pictures below: PECISION Precision is the degree to which several measurements provide answers very close to each other. It is an indicator of the scatter in the data.The lesser the scatter, higher the precision. The pictures given below clearly describe Accracy and Precision. EXAMPLES If we measure the length of a foot-ruler and get values of 12.01 in, 12.00 in, 11.99 in, 12.00 in. These numbers are precise enough for us to believe that if we measure it again we would get 12.00+0.01 in. These measurements are precise but necessarily accurate. The foot-ruler may actually be metric ruler of 30.0 cm long. Our measurement is precise but not accurate.  Helpful Websites: Struggling with making data tables & graphs? Check this link out: https://edu.gcfglobal.org/en/excel2016/ Statistics in Biology: https://www.nature.com/collections/qghhqm/content/statistics-in-biology Making Error Bars Using Google |
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