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The data collected does not have to be measurable.
Data is collected and recorded down every time an item is scanned at the cashier and with the use of loyalty cards supermarkets are able to track individual customers.
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.