Only in an experimental research design can you make cause-effect statements based upon your findings.
A Research Study Designs is one that can lead to the case above. Note that Research Study Designs is seen as a process that is made up of a lot of study designs, that is said to be existing across a lot of academic fields.
Note that Study designs are seen as the types of variables that are to be analyzed in any study and as such, Only in an experimental research design can you make cause-effect statements based upon your findings.
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