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An experiment in which only one variable is changed is a(an) __________ experiment.

A. randomized
B. natural
C. double blind
D. controlled

Respuesta :

D. controlled 
is the right answer because an experiment in which an observer tests a hypothesis by looking for changes carried by alterations to a variable.
garydesir1

Hi


The correct answer is : D

Because a control experiment is one in which a hypothesis is tested by the manipulation of a single variable.


I hope that's help:)

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