there are few types of errors in levelling......
these arr......
1- instrumental error
2- collimation error
3- errors due to curvature and refraction
4- some other errors also
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by replicating treatments
Percent error.
Random errors can be parallax and from changes in the environment.
Experimental errors occur when the performer of experiment make a mistake. now Performer may be a human or it can be a machine or any apparatus and mistake may be of intentional, Conventional or mistake by mistake.
independent analysis blank determinations variation in sample size