In all scientific investigations, there are observations, data, and conclusions. However, not all scientific investigations are experiments. For an investigation to be an experiment, there must be a test variable (independent), outcome variables (dependent), and __________ variables. Investigations can also be comparative. These investigations observe groups in different conditions and compare the data. There __________ test and outcome variables, but no controls. In descriptive investigations, the observer records information and makes conclusions based on the data. There __________ of any kind, and comparisons are not made between objects or groups.
confined
might be
continuous
controlled
are always
are no variables
The correct answer is controlled.
In scientific investigations, especially experiments, controlled variables are those that remain constant to ensure that the test results are due to the manipulation of the independent variable. This allows for a clearer understanding of how the independent variable affects the dependent variable. In comparative investigations, there might be test and outcome variables, but they do not involve controlled variables since the focus is on comparing different groups rather than testing a specific hypothesis. Descriptive investigations do not involve any variables or control since they simply observe and describe phenomena.
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