A Researcher Wishes to Study the Effects of Preoperative Teaching

A researcher wishes to study the effects of preoperative teaching on anxiety levels among toddlers and preschoolers undergoing surgery.To reduce the potential for measurement error,the researcher will

A) ask study subjects to describe feelings of anxiety.
B) develop a new tool to measure anxiety levels in children.
C) rely on multiple observers to collect data for this study.
D) use a standardized checklist of anxiety behaviors.

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