A is your best choice from this list. A counfounding variable can occur when you cannot distinguish between multiple variables because of a lack of or error in establishing a control group. https://study.com/academy/lesson/confounding-variables-in-statistics-definition-examples.html...
See other types of variables in research, including confounding and extraneous variables. Related to this QuestionWhat are the variables in a correlational hypothesis? What are standardized variables? What are explanatory and response variables? What is a dependent variable? What are independent and dep...
In a study, what is a dependent variable? Explain the meaning of the concept: "Sometimes the researcher cannot assign some variables." What is the difference between Quasi-Experimental and Qualitative Research? If the significance level that you obtain for Levene's Test for Equality ...