A researcher wants to know if a teacher's race and gender affects student achievement in Introductory Statistics classes. Teacher A describes himself as a White male and is assigned to teach 30 students. Teacher B describes herself as an Asian female and is assigned to teach a separate 30 student class.

Identify what is NOT a confounding variable in the scenario.

• 1. )The demographic of Teacher A's students
• 2. ) The demographic of Teacher B's students
• 3.) The Introductory Statistics class (i.e. which section)
• 4.) The teacher's education level
• 5.) The teacher's experience as an instructor