The following questions refer to the figure below of an axial, T2-weighted MRI of the lumbar vertebra. 
-Which line points to the thecal sac?
Definitions:
Solomon Four-group Design
An experimental approach to assess the potential effects of pretesting on participants by including both pretested and non-pretested groups with and without the intervention.
Pretest Impact
The influence that prior testing might have on the participants' subsequent performance on a posttest, affecting the interpretation of an intervention's effect.
Posttest Scores
The scores obtained from tests administered after an experimental treatment or intervention to evaluate its effects.
Independent Groups Design
A research design in which different groups of participants are exposed to different conditions or levels of the independent variable.
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