Question

In a controlled experiment, the factor tested is called the A. constant. B. independent variable. C. dependent variable. D. control.

Answer 1

C. Dependent Variable

Answer 2

In a controlled experiment, the factor tested is called the $\boxed{{\text{B}}{\text{. independent variable}}}$.

Further Explanation:

A procedure that is performed in order to support, disprove or validate a hypothesis is known as an experiment. A hypothesis is an idea or thought that needs to be tested with the help of experiments.

Types of experiments:

1. Controlled experiments

The type of experiment that is used for comparing the results of experimental samples with the control samples is called a controlled experiment. Such experiments involve a drug trial. The experimental group will be the one that receives the drug and the other one receiving regular treatment will be the controlled group. The experimental group is also known as the treatment group. Another example of controlled experiments is the protein assay.

2. Natural experiments

These are also called quasi-experiments. These are performed by exposing individuals to the conditions that are governed by nature. Experiments involving weather changes and natural disasters are examples of natural experiments.

3. Field experiments

These are quite different from the experiments performed in the laboratory. Such experiments are usually performed in social studies. These have higher external validity as compared to normal lab experiments. Economic analysis of health and education are some examples of such experiments.

The variable that can be changed by the investigator is called the independent variable while the variable is the one that is affected by the changes in experimental conditions. All the variables in a controlled experiment are kept constant; except for the factor that is to be tested. Such a factor is called the independent variable or the experimental variable.

Learn More:

1. What is the main purpose of conducting experiments? brainly.com/question/5096428
2. What is the percentage error in the experiment? brainly.com/question/11181911

Answer Details:

Grade: Senior School

Chapter: Keys to studying chemistry

Subject: Chemistry

Keywords: experiment, hypothesis, controlled experiment, natural experiment, field experiments, dependent variable, independent variable, quasi-experiments.