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quester [9]
3 years ago
14

A dentist wants to know whether posters of calming nature scenes will reduce patient anxiety. Which of these is the most importa

nt Confounding Variable in this experiment?
a) the age of the patient
b) a reduction of anxiety
c) how crowded the waiting room becomes
d) both a and c
Biology
1 answer:
ollegr [7]3 years ago
4 0

Answer:

d

Explanation:

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