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

Explanation:

In an experiment, the independent variable is what researchers change or manipulate. It's not always certain it will influence the dependent variable (A is wrong). It varies across groups (B is wrong). The dependent variable is influenced by the independent variable, not the other way around (C is wrong). So, D is correct as it aligns with the definition of an independent variable.

Answer:

D. is manipulated or varied by researchers