According to the article It All Adds Up about ethnic differences in school performance, if parts of three valid scales are taken and used to make up a new measurement scale, the new scale:

(a) will be three times as valid as the originals
(b) will only be as valid as one of the original scales
(c) may or may not retain any of the original validity of the scales
(d) will certainly not be valid

C

Psychology

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