It tells you where people are and when people have gone missing they can track them down. And the police use this data
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The data collected does not have to be measurable.
In continuous grouped data the data is collected continuously and in groups. Data collected is in class intervals the actual data values are not visible.
how is data collected and used for the purpose of national statistics
Primary data is the the data that collected by yourself. While secondary data is those collected by others and to be reused by yourself.
Primary data is data that is collected by the researcher. Secondary data is information that has been collected by someone other than the user.