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primary information is the information/data that you collected and secondary information is the data/information that is collected by someone else but you are using it.
Primary data is data that is collected by the researcher. Secondary data is information that has been collected by someone other than the user.
The data collected does not have to be measurable.
primary data is data which has been collected by yourself, which is more reliable and up to date. secondary data has been collected from a secondary source (Other people, business etc.) so it may not be valid or up to date
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.