Dr Ann L Retentive Wants to Establish Construct Validity for an Instrument

Dr. Ann L. Retentive wants to establish construct validity for an instrument to measure perfectionism. Which of the following is true about convergent evidence for validity?

A) There should be relatively low correlations between the instrument and other, theoretically related measures
B) The researcher should develop some hypotheses about what the instrument should predict based on a theoretical framework
C) The researcher needs to find a standardized, external criterion for comparison
D) a and c

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