Question

experimental design
lets check in
a(n) ______ refers to a substance or treatment that is often used in an experiment but does not have an actual medicinal or experimental benefit.
a extraneous variable
b placebo
c confounding variable
d independent control
please select the best answer from the choices provided.
a
b
c
d

Explanation:

A placebo is a substance or treatment used in experiments that has no real medical or experimental benefit. It is often used to create a control - like effect to compare with the actual treatment group. An extraneous variable is an outside factor that can affect the outcome of an experiment. A confounding variable is related to both the independent and dependent variables and can distort results. Independent control is not the correct term for this concept.

Answer:

B. placebo