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In an observational study researchers try not to A. Photograph any of the subjects B. Include people who are difficult to contact C. Ask questions that are too obvious D. Influence the people in the study
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In an observational study researchers try not to

A. Photograph any of the subjects
B. Include people who are difficult to contact
C. Ask questions that are too obvious
D. Influence the people in the study

User Ondrej Skopek
by
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1 Answer

6 votes

Answer:

D

Step-by-step explanation:

User Rob Louie
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