this is about extraneous variables

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this is about extraneous variables.

Identify all the extraneous variables you see. For each one, explain what type it is (e.g., social, personality), whether or not it is confounding, and how you could eliminate or minimize the problem it creates with the following scenario below.

 Jared and Molly are conducting an experiment on how performance is affected by the presence of other people. They ask their participants to solve a series of difficult math problems in one of two conditions: alone or in a large group. All the volunteers for the Alone condition are recruited from an Introductory Psychology class, and those for the Group condition are recruited from a Social Psychology class. Jared tests the individuals in the Alone condition, and Molly tests the Group condition. The two rooms they have reserved are appropriate for the treatment sizes; Jared's is very small and Molly's is an auditorium. While they are testing some of their participants, the lights in the rooms go out for a minute or so (this happens occasionally to both Jared and Molly). They each grade half of the problems from each condition; but when Molly grades them, she marks any problem wrong if the participant failed to show his or her work, whereas Jared only marks a problem wrong if the answer was incorrect.