The data collection method accurately measures all the variables important to do is that none of these are correct.
Data collection refers generally to the process of gathering and measuring information. This information is gathered on targeted variables in a system that is established.
It then enables one to measure all the variables and answer the questions and evaluate the outcomes.
There are various methods of data collection like Questionnaires, interviews, observation.
But none of these measures accurately all the variables that are important. Thus, we can say that none of the above options are correct.
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