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.Which might be a threat to internal validity in this study?

A) The concept of cue-based feeding is not well defined.
B) The study sample is homogeneous.
C) Some infants developed gastroenteritis.
D) Not all nurses received cue-based protocol education.

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