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A group of teachers wanted to compare reading progress among elementary school students. They randomly selected students in each grade, first through fifth. Students were

A group of teachers wanted to compare reading progress among elementary school students. They randomly selected students in each grade, first through fifth. Students were given a reading test and scores were then compared. Which research method was used during this process? (3 points) Case study Cross-sectional study Laboratory experiment Longitudinal study Naturalistic observation

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