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"Lena, look," Hartley said, tapping his desk. "I installed it in Ms. Chen’s third-grade class. She’s our best teacher. The other third-grade class, Mr. Abel’s, is using the old curriculum. After three months, I’ll compare their test scores. Simple, right?" quasi-experimentation a guide to design and analysis pdf

Dr. Lena Torres, a research consultant, faced a familiar problem. The school principal, Mr. Hartley, had just spent $50,000 on a new "MindGrow" reading software. He needed to know if it worked. Since the full Cook & Campbell (1979) PDF

This is the domain of . For decades, researchers across education, economics, public health, political science, and psychology have relied on quasi-experimental designs (QEDs) to draw causal inferences without full randomization. She’s our best teacher