A research conducts a quasi-experimental study to determine whether there is improved weight gain among premature infants who are fed according to cue based protocols.

A research 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 review notes that parents who gave control to participate in the study were from higher socioeconomic class than the population as a whole. This is a threat to:

a)statistical conclusion validity

b) external validity

c) construct validity

d) internal validity

 

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