ac12333 ac12333
  • 26-08-2020
  • Biology
contestada

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

Respuesta :

9hn6pawddy 9hn6pawddy
  • 07-09-2020

Answer:

D

Explanation:

Answer Link

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