Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Rucha rajesh shingvekar
(B) Systematic sampling error An error that arises from some basic defect in the sampling or preparation process such that the result obtained is always either higher or lower than the true figure. For example of systematic sampling see attachment.