EVERYDAY SCIENCE

Detailed explanation-1: -The independent variable is the variable that one manipulates in an experiment. In an appropriately designed experiment, a scientist is able to test the effect of a single variable. This allows the scientist to determine if the variable that is manipulated has an impact on the subject.

Detailed explanation-2: -A controlled experiment is a scientific test that is directly manipulated by a scientist, in order to test a single variable at a time.

Detailed explanation-3: -To test for one variable, scientists usually study two groups or situations at one time, with the variable being the only difference between the two groups.

Detailed explanation-4: -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-5: -Each controlled experiment looks at the effect of one variable (the independent variable) on some event or condition (the dependent variable). So the independent variable is the factor being tested and the dependent variable is the factor being observed and measured.