Sources of Science Self-Efficacy Scale

The sources of science self-efficacy were assessed with the Sources of Science Self-Efficacy Scale, which was adapted from a scale used to measure this construct in the domain of mathematics (see Lent, Lopez, et al., 1996). It consists of four subscales measuring the effects of mastery experiences (eight items; sample: ‘‘I got a good grade in science class last semester’’), vicarious experiences (seven items; sample: ‘‘Many of the adults I most admire are good in science’’), social persuasions (eight items; sample: ‘‘My teachers believe I can do well in difficult science courses’’), and physiological states (eight items; sample: ‘‘Science makes me feel uncomfortable and nervous’’).

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