Questions: In the scientific method experiment, pillbugs were added to a choice chamber with two sides connected by a channel that allowed the pillbugs to move to either side. One side of the container was lined with sand (no nutrients) and the other side was lined with cornstarch which contained nutrients. Based on your understanding of the experiment and its variables, select the INCORRECT statement below: A controlled experiment allows comparison between a control group and a test (experimental) group that has been exposed to an experimental factor (the variable). Experiments are typically conducted with one types of variables such as an independent, dependent, or standardized variable. A controlled experiment is often conducted in multiple trials. A controlled experiment allows scientists to test hypotheses and to draw conclusions based on reproducible results.

The answer is the second one: "Experiments are typically conducted with one types of variables such as an independent, dependent, or standardized variable."

Explanation for each option:

1. A controlled experiment allows comparison between a control group and a test (experimental) group that has been exposed to an experimental factor (the variable).

   • This statement is correct. A controlled experiment involves comparing a control group, which is not exposed to the experimental factor, with an experimental group that is exposed to the factor. This allows for the assessment of the effect of the variable.

2. Experiments are typically conducted with one types of variables such as an independent, dependent, or standardized variable.

   • This statement is incorrect. Experiments typically involve multiple types of variables:
     • Independent variables are the factors that are manipulated by the researcher.
     • Dependent variables are the factors that are measured in the experiment.
     • Standardized variables (or controlled variables) are factors that are kept constant to ensure that the results are due to the independent variable alone.

3. A controlled experiment is often conducted in multiple trials.

   • This statement is correct. Conducting multiple trials helps to ensure that the results are reliable and not due to random chance.

4. A controlled experiment allows scientists to test hypotheses and to draw conclusions based on reproducible results.

   • This statement is correct. The purpose of a controlled experiment is to test hypotheses and draw conclusions that can be reproduced by other scientists, thereby validating the findings.

Summary: The incorrect statement is the second one: "Experiments are typically conducted with one types of variables such as an independent, dependent, or standardized variable." This is incorrect because experiments usually involve multiple types of variables, not just one.