Differentiate between work study and method study.
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metrology
The difference between internal and external validity is in their nature. Internal validity indicates if a study depicts relation between two variables. External validity on the other hand generalizes the study of the variables.
Bible Study is taking in spiritual information. Preaching is giving it back out.
Trigonometry is specificly the study of a right triangle. For example, what is the cosine? Geometry is the study on shapes.
Cryptology is the study of codes and ciphers while cryptography is the creating of codes and ciphers.