CHEM 102 Lecture Notes - Lecture 2: Standard Deviation

• School: University of Illinois
• Department: Chemistry
• Course: CHEM 102
• Professor: Overcash John

Document Summary

This type of error affects overall accuracy but doesn"t affect precision. Error could result in data being precise but not accurate o. Type of error occurs if you use a buret that was calibrated incorrectly when it was made. Reading from buret marked @ 0. 1 ml should be recorded to 0. 01 ml. Avg. value is used to give indication of the accuracy of measurements. St. dev. gives idea of precision of measurements. Measure of agreement b/t 2+ values in data set. Gives idea of reproducibility of measurement (closely spaced, even if far from correct answer)