Missy Is Using a Multiple Probe Across Participants Design to Evaluate

Missy is using a multiple probe across participants design to evaluate the effects of peer tutoring to teach three students to complete division problems. These three students have had no prior instruction in division. Missy MOST LIKELY chose a multiple probe design rather than a multiple baseline design because.

A) the students' baseline scores will be zero.
B) the students could not miss class very often.
C) other extraneous variables may cause their skills to improve.
D) she is interested in comparing the effects of three interventions at once.

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