INTRODUCTION
SCIENTIFIC INQUIRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Because it is hard to setup a data table with more
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To know what is causing the changes
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It is what has always been done
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No one really knows
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Detailed explanation-1: -As long as the experiment is repeated a sufficient number of times, it does not matter how many variables are used. Yes, an experiment should test only one variable at a time. This ensures that the experimental outcome is clearly due to one identifiable factor.
Detailed explanation-2: -A controlled experiment works with one variable at a time. If several variables were changed at the same time, the scientist would not know which variable was responsible for the observed results.
Detailed explanation-3: -Testing only one variable at a time lets you analyze the results of your experiment to see how much a single change affected the result. If you’re testing two variables at a time, you won’t be able to tell which variable was responsible for the result.
Detailed explanation-4: -The thing that is changed on purpose is called the manipulated variable. Sometimes it is also called the independent variable.
Detailed explanation-5: -The independent variable is the one that is changed by the scientist. To insure a fair test, a good experiment has only ONE independent variable. As the scientist changes the independent variable, he or she records the data that they collect.