[Gresham HS: Student Watershed Research Project]

Analysis of Data

Rounding Significant Digits:



Standard Deviation : A measure of the average amount the data deviates from the average of the data set. (Usually reported as in the following example: (Mean dissolved oxygen = 10 mg/L DO +/- 0.50 mg/L.)

Coefficient of Variance: Useful in comparing the accuracy of a set of tests (Like 5 replicate tests of DO.)

Correlation Coefficient: Used to determine how closely two different sets of data correlate (Ex: DO & Temp.)

Percent Deviation: Used to calculate how accurate student determined data is by comparing it to a known standard or to values determined by an established government lab! This is for Quality Control purposes!