Of these four scientific designs, choose the one that has a biased design.
In a study to determine how bees react to color, both color and light levels are varied.
In a study of the effect of temperature on chick hatching times, all variables are controlled except temperature.
In a study of the effect of a vitamin on energy levels, the experimental and control groups each have 50 randomly chosen people.
In a study of the effect of an antibiotic on bacterial populations, there are several experimental groups at different antibiotic concentrations and one control group receiving no antibiotic.
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In a study to determine how bees react to color, both color and light levels are varied
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