In a study of the results of a diabetes teaching program conducted at a senior center, the blood glucose levels are taken by volunteers using their own personal equipment and were compared before and after the program. What potential threat to internal validity is demonstrated in this study

Instrumentation validity

Explanation:

The potential threat that exists in this scenario, is Instrumentation validity. This happens when different instruments are used to test the same thing. There exists the possibility that some of those instruments are not necessarily measuring what they are supposed to be measuring, correctly. This ultimately gives mixed results and can ruin a study. Which is what is happening in this scenario as all the volunteers are using their own "separate" personal equipment.

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