A group of students were surveyed to see how many used product A, product B, or product C. The following is a Venn diagram showing the results of the survey: 
How many students were surveyed?
Definitions:
Observer Reliability
The degree to which different observers consistently assess or record behaviors, outcomes, or events in the same way.
Test-Retest Reliability
A measure of the consistency of a psychological test or assessment when the same instrument is administered to the same group of people on two different occasions.
Test-Retest Reliability
The consistency of a measure assessed by administering the same test to the same group of individuals at two different points in time.
Face Validity
A measure of how suitable, relevant, or meaningful a test or procedure appears on the surface, even if not necessarily proven through empirical means.
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