Question: When conducting a controlled experiment, why do you use a standard?
Reference answer: A standard is used for comparison to determine how changing one variable changes the results.

Student answer: You have a standard because if you do not it will not be controlled.

Student answer: So that you can see the results of an experiment before a variable is changed so you can compare.

Student answer: You use a standard so you will not make a mistake and so you can compare it to differences.

Student answer: You start with a standard so you can compare your standard data to your data when you change a variable.

Student answer: So you can get the closest answer to the question.

Student answer: So you can record and change variables to get a difference.

Student answer: So that control your experiment without changing more than one variable.

Student answer: To keep the variables controlled.

Student answer: You use a standard so you can tell what happened in a controlled experiment and because you can change one variable at a time.

Student answer: You would use a standard to change any variables than just one variable that can be changed.

Student answer: You use a standard to control your procedure, like if you get it wrong you can see what you did.

Student answer: To compare the new experiment with the standard.

Student answer: You use a standard because when you change something which is a variable. That when you change it, you know when you did before.

Student answer: You use a standard because without a standard, you can change it.

Student answer: So you can see what you did after you do the other trials, it makes a controlled experiment to look back on when you change one variable at a time.

Student answer: You use a standard to see if you can try a less amount each time you do an experiment.

Student answer: You use a standard so that you can test it and compare with your standard. And compare with your variable.

Student answer: When conducting a controlled experiment you use a standard because you compare your other results to see if it is accurate.

Student answer: You use a standard so you can change the variable if needed in an experiment and you can also change the variable at a time.

Student answer: You use a standard because that what you know before the experiment and the standard helps you a lot during the experiment.

Student answer: In a controlled experiment you use a standard because when you are testing something else you will have to compare your answers. That is where a standard comes in.

Student answer: To compare your answers.

Student answer: We use a standard first because we could know how it went then we could use the score it went and test it again.

Student answer: You use a standard is to know what you will do and how it will happen.

Student answer: So when you change variables you can compare you standard and the other ones.

Student answer: So you can test the standard and can switch one variable to make it proven.

Student answer: Because you want to know what is the regular way and to compare the first way.

Student answer: So you can compare your answers.

Student answer: To compare the experiment with the standard one.

Student answer: So when you are done you could compare.

Student answer: So you compare at the end of the experiment.

Student answer: To see if the standard might be faster than the other.

Student answer: Because you can compare the results.

Student answer: To help control the controlled experiment.

Student answer: To control any experiment.

Student answer: Because without a standard you will not know the steps.