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Students’ confidence in their data analysis skills. A) percent of overall responses of “I don’t know” on basic- and advanced-level questions on pre- and posttest. B) percent of students who responded “I don’t know” on each question of the pre- and posttest. * Indicates that these questions did not have an “I don’t know” response option. Gray bars represent pretest percentages and black bars represent posttest percentages. n = 94.
