A biologist wants to determine the effect of a diet supplement using white rats. A shipment of 20 rats is obtained from a biological supply firm. They arrive in a single box. The biologist reaches into the box and the first ten rats caught are assigned to the control group and the remaining rats are assigned to the experimental group receiving the supplement. Select the potential source of confounding.
A) Method of formation of the control and treatment groups
B) Experimenter effect
C) Placebo effect
D) The study is essentially free from potential sources of confounding.

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The Answer of A biologist wants to determine the effect of a diet supplement using white rats. A shipment of 20 rats is obtained from a biological supply firm. They arrive in a single box. The biologist reaches into the box and the first ten rats caught are assigned to the control group and the remaining rats are assigned to the experimental group receiving the supplement. Select the potential source of confounding.
A) Method of formation of the control and treatment groups
B) Experimenter effect
C) Placebo effect
D) The study is essentially free from potential sources of confounding.

A Biologist Wants to Determine the Effect of a Diet