Types of data:
On the basis of Reliability:
1.Biased
2.Unbaised
Biased Data:
There is error probability in such a data. In secondary data biasness is possible. It can be reduced by honesty of researcher and accurate & standard machine comparison.
Unbiased Data:
Less error probabobility. not 100% accurate but free from detectable errors.
Lack consistent error unlike biased.
Raw Data:
First time recorded information without any sequence or arrangement.



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