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A researcher wants to study whether a new teaching method improves test scores. She randomly selects 60 students from a school of 800 students (random sampling), then randomly assigns 30 to the new method and 30 to the traditional method (random assignment). Which statement is correct? (Choose all that apply.)
A researcher wants to study whether a new teaching method improves test scores. She randomly selects 60 students from a school of 800 students (random sampling), then randomly assigns 30 to the new method and 30 to the traditional method (random assignment). Which statement is correct? (Choose all that apply.)