Analyzing Data and Drawing Conclusions

Question 8 • RVACR Ecology

Of these four scientific designs, choose the one that has a biased design.

Answer

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.

Explanation

A biased design changes both color and light levels, so it is impossible to tell which factor caused the bees’ reactions. A fair test changes only one variable at a time while keeping other conditions constant. The other designs describe controlled variables, randomly chosen groups, or several treatment levels with a control group.

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