In an experiment, what is the independent variable?

In an experiment, what is the independent variable?

• A. The variable kept constant.
• B. The variable that scientists change or manipulate.
• C. The variable that is measured.
• D. The rate of data collection.

Answer: (B)

In an experiment, the independent variable is what you deliberately change to test its effect. This is the factor you manipulate to see how it influences the outcome, while keeping other conditions the same so that any observed change can be attributed to this variable. For example, if you want to study how sunlight affects plant growth, you would vary the amount of sunlight each plant receives (the independent variable) and measure how tall the plants grow (the dependent variable). You would keep other factors like soil, water, and temperature constant to isolate the effect of sunlight. The rate of data collection is a methodological choice, not the variable you test to produce an effect.

In an experiment, the independent variable is what you deliberately change to test its effect. This is the factor you manipulate to see how it influences the outcome, while keeping other conditions the same so that any observed change can be attributed to this variable. For example, if you want to study how sunlight affects plant growth, you would vary the amount of sunlight each plant receives (the independent variable) and measure how tall the plants grow (the dependent variable). You would keep other factors like soil, water, and temperature constant to isolate the effect of sunlight. The rate of data collection is a methodological choice, not the variable you test to produce an effect.