6. Reliability and Validity

The concepts of reliability and validity are extremely important to any research and both are associated with the research instruments used. The reliability of any method of collecting data is a statistically determined coefficient (number), ranging from -1 to +1, and is defined as the ability of a measurement instrument to give the same results when it is repeated using the same subjects. The validity of an instrument is determined primarily in philosophical terms regarding its value or relevance. There is no simple statistical method to determine the validity of an instrument.

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