To study the effect of the teacher's gender on children's scholastic performances, third-graders in a large school are randomly assigned to classes with female teachers or to classes with male teachers. This is a

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This is a field experiment because it involves manipulating an independent variable (teacher's gender) in a real-world setting (a school) to observe its effect on a dependent variable (children's scholastic performances).

To Study the Effect of the Teacher's Gender on Children's