In a cognitive psychology study on lexical decision tasks, a researcher notes that the mean reaction time for recognizing highly familiar words (M1=380 msM_1 = 380\text{ ms}M1=380 ms) is of a completely different magnitude and significantly smaller than the mean reaction time for recognizing rare pseudowords (M2=3150 msM_2 = 3150\text{ ms}M2=3150 ms). To formally report that the mean reaction time for familiar words is 'much less than' the mean reaction time for pseudowords, which mathematical symbol should be used in the expression M1 □ M2M_1 \ \Box \ M_2M1 □ M2?
≪\ll≪
<<<
∝\propto∝
≈\approx≈
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.