A scientist performs a controlled experiment. This means that
A) the experiment is repeated many times to ensure that the results are accurate.
B) the experiment proceeds at a slow pace to guarantee that the scientist can carefully
observe all reactions and process all experimental data.
C) the experiment consisted of an experimental group and a control group that were
compared.
D) two experiments are conducted, one differing from the other by two or more
variables.
E) the experiment consisted of a control group that was carefully chosen to be the
opposite of the treatment group which was chosen at random.
I know it is not D because it is only one single variable. A is not bc it says "many times"
Please help
Based on the information provided, we can eliminate options D and A.
Option D states that two experiments are conducted, one differing from the other by two or more variables. However, a controlled experiment typically involves only one variable being manipulated while keeping all other variables constant.
Option A suggests that the experiment is repeated many times to ensure accurate results. While repetition can be a part of the scientific process to increase reliability, it is not a defining characteristic of a controlled experiment.
Now let's review the remaining options:
B) The experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data.
C) The experiment consisted of an experimental group and a control group that were compared.
E) The experiment consisted of a control group that was carefully chosen to be the opposite of the treatment group, which was chosen at random.
The correct answer is C) The experiment consisted of an experimental group and a control group that were compared. In a controlled experiment, the scientist typically sets up two groups: an experimental group and a control group. The experimental group is exposed to the manipulated variable (independent variable), while the control group remains unchanged or receives a standard treatment. By comparing the results of the two groups, scientists can determine the effect of the independent variable on the outcome.
Option B implies a slow pace for careful observation and data processing, but this is not a defining characteristic of a controlled experiment.
Option E mentions a control group chosen to be the opposite of the treatment group, which is not necessary in a controlled experiment. The control group should represent the baseline or standard condition, rather than being chosen as the opposite of the treatment group.
In summary, the correct answer is C) the experiment consisted of an experimental group and a control group that were compared.
Based on the options provided, the correct answer is C) the experiment consisted of an experimental group and a control group that were compared.
In a controlled experiment, the scientist sets up two or more groups: an experimental group, which receives the treatment or intervention being tested, and a control group, which does not receive the treatment. This allows the researcher to compare the results between the two groups and determine the effect of the treatment.
Option A can be eliminated because repeating the experiment many times is part of the process of ensuring accuracy but does not define a controlled experiment. Option B is not specific to controlled experiments and does not capture the concept of comparing groups. Option D is incorrect because a controlled experiment typically involves manipulating only one variable while keeping others constant. Option E is also incorrect because the control group is not chosen to be the opposite of the treatment group.
So it must be B, C, or E.
https://biologydictionary.net/controlled-experiment/