Susan Examined Differences in Students' Sustained Independent Reading Time Between

Multiple Choice

Susan examined differences in students' sustained independent reading time between classrooms with and without a paraprofessional in the room and is
Writing her report. She is likely concerned with which of the following questions
Related to her causal-comparative study?

A) Is a rationale given for selection of predictor variables?
B) Were the sources of data related to the problem mostly primary?
C) Was the resulting prediction equation validated with another group?
D) Is the independent variable clearly defined or described?