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measurement error

in classical test theory, any difference between an observed score and the true score. Measurement error may arise from flaws in the assessment instrument, mistakes in using the instrument, or random or chance factors. For example, an investigator may obtain biased results from a survey because of problems with question wording or response options, question order, variability in administration, and so forth.

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Psychology term of the day

November 6th 2024

salivary gland

salivary gland

any of several glands located in the wall of the mouth that secrete a fluid (saliva) containing the enzyme gamma-amylase (ptyalin). The major salivary glands are the paired parotid, submaxillary, and sublingual glands; smaller glands are scattered over the cheeks and tongue. See also salivation.