Data that is collected may have been collected previously for some reason, or it might have been collected recently. Data is usually collected to show statistics or information about something specific.
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Observations
Any kind of data can be collected.
The collected data is organized in a fashion so you can determine if the hypothesis is supported.
data collected over several time periods is what type of data?
Secondary data is collected by someone other than the researcher, such as census information. Primary data is collected first hand, such as interviews.