Final answer:
A good experimental study should include random assignment, control groups, and avoid biases. A poor study may lack these components and introduce confounding variables.
Step-by-step explanation:
A good experimental study should include key components such as random assignment of subjects to treatment groups and having a control group. For example, a good experimental study could be testing the effectiveness of a new medication on reducing anxiety. Participants would be randomly assigned to either the experimental group, which receives the new medication, or the control group, which receives a placebo. This design would help eliminate biases and potential pitfalls.
On the other hand, a poor experimental study might lack random assignment or a control group. For instance, a poorly designed study on the effects of a new teaching method on student performance might have all the high-performing students assigned to the experimental group, while the low-performing students are in the control group. This would introduce a confounding variable and make it difficult to draw valid conclusions.