A Researcher Conducts a Quasi-Experimental Study to Determine Whether There

A researcher conducts a quasi-experimental study to determine whether there is improved weight gain among premature infants who are fed according to cue-based protocols.The researcher trained neonatal intensive care nurses to apply cue-based feeding to orally fed infants and notes a statistical difference in weight gain between infants fed according to cue-based protocols and those fed according to standard protocols.The reviewer notes that parents who gave consent to participate in the study were from a higher socioeconomic class than the population.This is a threat to

A) construct validity.
B) external validity.
C) internal validity.
D) statistical conclusion validity.

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