In order to make this experiment partly a blind procedure a) ...

[segrsyd]

In order to make this experiment partly a blind procedure
 
  a) the person handling and injecting the rats should not know which drug group the rats are in.
  b) the principal investigator should not know which group the rats are in.
  c) The rats should be kept in the dark during the activity tests.
  d) The rats should be housed in separate cages.

Question 2

When variables compete to explain the same effects, what are they sometimes called?
 
  a) contradictory
  b) intertwining
  c) confounding
  d) interdependent

[shailee]

Answer to Question 1

A

Answer to Question 2

c

[segrsyd]

Thanks for the timely response, appreciate it

[chereeb]

TYSM