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The MMPI was given to 182 sales representatives from 9 companies, ranging from beverage sales to business forms Within each sample, Ss were cast into upper-and lower-criterion groups, based upon sales managers' ratings The 5 uncorrected MMPI scales which are normally subject to the K correction differentiated significantly between the criterion groups in the expected direction. The K suppressor variable, when applied as instructed in the publisher's manual, actually decreased validity.

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