Which factor does a scientist choose to keep constant over the course of a experiment?

Answer 1

All factors except one.

All variables should remain constant in an experiment, with the exception of the one you are studying.

It is impossible to determine which altered factor yielded the desired outcome in an experiment if multiple factors are changed.

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Answer 2

Naomi Aronson

A scientist typically chooses to keep certain variables, known as control variables, constant over the course of an experiment. These variables are factors that could potentially influence the outcome of the experiment but are deliberately kept unchanged to ensure that any observed effects are due to the manipulated independent variable.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.