INTRODUCTION
SCIENTIFIC INQUIRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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To have an extra variable.
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to compare and ensure the IV affects the DV.
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Either A or B
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None of the above
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Detailed explanation-1: -The two main variables in an experiment are the independent and dependent variable. An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.
Detailed explanation-2: -In a scientific study, a control group is used to establish causality by isolating the effect of an independent variable. Here, researchers change the independent variable in the treatment group and keep it constant in the control group. Then they compare the results of these groups.
Detailed explanation-3: -In an experiment, the IV is a variable that is changed to see how it affects something else, whereas the DV is a variable that is being measured/observed. The DV is assumed to be affected by the IV, hence the term ‘dependent’ (its value depends on the state of the IV).
Detailed explanation-4: -The purpose of a controlled variable is to keep all conditions as similar as possible between two subjects except for the independent variable. This allows scientists to carefully look at the effect the independent variable has on the dependent variable.