In a Research Study,ambulatory Clinic Nurses Teach Children with Asthma

In a research study,ambulatory clinic nurses teach children with asthma how to monitor peak expiratory flow volumes and how to use metered-dose inhalers to determine whether asthma control scores improve.The researcher discovers inconsistencies in how these measures were taught and how well the children understood the concepts.This represents a lack of

A) control of extraneous variables.
B) internal validity.
C) intervention fidelity.
D) precision of measurement.

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