Question

in an experiment, the independent variable ______.
a. always influences the dependent variable
b. is the same for all groups in an experiment
c. is influenced by the dependent variable
d. is manipulated or varied by researchers

please select the best answer from the choices provided

a
b
c
d

Explanation:

Define independent variable

The independent variable is the factor that is deliberately manipulated, changed, or varied by the experimenter to observe its effects.

Evaluate the options

• A is incorrect because the independent variable does not always influence the dependent variable (the null hypothesis might be true).
• B is incorrect because the independent variable must vary across different groups or conditions.
• C is incorrect because the dependent variable is what is measured to see if it is influenced by the independent variable, not the other way around.
• D is correct because it matches the definition of the independent variable.

Answer:

• A. always influences the dependent variable
• B. is the same for all groups in an experiment
• C. is influenced by the dependent variable
• D. is manipulated or varied by researchers (Correct answer)