An instrument measuring what it purports to measure is said to be ___________, while one that produces the same results repeatedly is said to be ________________.

The statement accurately describes the concepts of validity and reliability in measurement instruments. An instrument that measures what it is supposed to measure is termed "valid." Validity ensures that the tool accurately reflects the specific construct or outcome it aims to assess, indicating its appropriateness for the intended purpose. For instance, if a health education test measures knowledge about nutrition, it must accurately evaluate that knowledge rather than unrelated areas.

On the other hand, an instrument that produces the same results repeatedly is described as "reliable." Reliability refers to the consistency and stability of measurements over time, regardless of varying conditions. A reliable tool will yield similar results under consistent circumstances, which is critical for ensuring that the findings can be trusted to reflect actual conditions accurately.

Understanding these two terms is essential for health educators and researchers, as they emphasize the importance of both accurate measurement (validity) and consistent measurement (reliability) in effective data collection and implementation of health programs or interventions.