A Professor Wants to Determine Whether Her Students Perform Better

A professor wants to determine whether her students perform better on mid-term examinations if they write their exam alone or in a group.To experimentally investigate this possibility,she randomly assigns half of her students to write their mid-term in the regular class setting (as a group) and randomly assigns the other half of her students to write their mid-term individually in private cubicles in the university's testing centre.Which of the following is a potential confound for this study?

A) The students assigned to the control or experimental groups
B) The mid-term exam scores
C) Memory cues linked to the classroom setting
D) The amount of time required to write the exam

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