Can you help me identify the major

Can you help me identify the major variables in a resear study that are NOT demographic variables? “The purpose of this study wast o test the effects of an ELNCC on students’ TSET scores over a 2-year period and to compare the results with those of a graduating class who did not have the ELNCC. The first objective was to determine if students sustained the higher levels of TSE found at the end of an ELNCC (Stiles et al.,2018) over the remaining 18 months of the program. The second objective of this study was to compare the levels of TSE at program exit (graduation) in the experimental group versus the control group of nursing students who did not take the course.”

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