A study by McDonald and Flanagan evaluated the effects of traumatic brain injury. Which of the following is true about their study?
A) causal conclusions could be drawn
B) random assignment was used, rather than matching
C) the study used a multilevel, independent groups design
D) the study used a subject variable with two levels

Question

Quizplus · Accepted Answer

The study used a subject variable with two levels, as traumatic brain injury was either present or absent in the participants. Causal conclusions could not be drawn as the study was not experimental and did not involve random assignment. Matching was not mentioned as a method used in the study. A multilevel, independent groups design was not specified.

A Study by McDonald and Flanagan Evaluated the Effects of Traumatic