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Primary sources of data are original and collected directly by the researcher, like surveys, interviews, and experiments. They provide first-hand, unprocessed information. In contrast, secondary sources are based on existing data that has already been collected and analyzed by others, like books, articles, and reports. Primary data is more accurate and specific to the researcher's needs, while secondary data offers insights from already available information.
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.