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International Journal of STEM Education
Fig. 3 | International Journal of STEM Education

Fig. 3

From: Measurement in STEM education research: a systematic literature review of trends in the psychometric evidence of scales

Fig. 3

Frequencies of sample size ranges. When papers reported on several studies (e.g., pilot study, main study) the sample sizes reported were counted separately. When papers reported samples from several populations (i.e., different universities), the samples were summed up and counted as one. Many papers reported sample sizes for expert judge evaluations and cognitive interviews, but we did not count those in this analysis

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