what are the main sources of errors in the collection of data?

Hey Prateek,
There are  two types of statistical errors that can occur during the collection of data.
a. Sampling Errors  
b. Non Sampling Errors

Sources of Sampling errors:
1. E
rrors can occur on account of the bias or the discretion of the investigator, they are known as biased sampling errors.
2. Errors can occur due to pure chance factor rather than the bias of the investigator, they are known as unbiased errors.

Sources of Non Sampling errors:
 The respondent may not provide the correct information to the interviewer.
2.  Sometimes the investigator may misinterpret the data.  

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