Sources of error in an economic survey

Sources of error refer to problems in sampling that reduce the ability to make accurate deductions about the population as a whole. Examples of sources of error are:

Non observation errors: choosing a bad sample, not getting a high response from the sample that you do choose, etc

Observation errors: respondent and interviewer bias

Processing errors: incorrectly organizing or categorizing the data

muslims control the north africa during the period of 1500 up

to 1800. they made a barrier to prevent further european exploration from

entering the africa from the north. however, the dutch ware still able to move

toward the interior with having south africa as one of the routes leading to

the east for trading with asia.

answer; by looking at total product,marginal product,and changes in both after changes in inputs