Examlex
A soap bubble with air on both sides has an index of refraction of 1.33. What minimum
thickness of the wall of this bubble will ensure maximum reflectance of normally incident
light having a wavelength of 530 nm?
Internal Validity
The extent to which a study establishes a trustworthy cause-and-effect relationship between a treatment and an outcome.
Observed Score
The score actually obtained by an individual on a test or measurement.
True Score
The true score in psychometrics is an estimate of an individual's actual ability or trait level, free from measurement error.
Error Score
The difference between an observed value and the true value in data collections or experiments, indicating the amount of error in measurements.
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