Primary Outcomes (explanation)
STEM interest and enjoyment. This outcome will be constructed from grade-appropriate survey items measuring students’ interest in and enjoyment of mathematics, science, technology, programming, and robotics, as well as their perceptions of the usefulness of STEM subjects. Items will be coded so that higher values indicate greater interest and enjoyment and combined into a standardized index within educational level.
STEM anxiety. This outcome will be constructed from grade-appropriate survey items measuring whether students feel nervous or afraid when studying mathematics or solving difficult mathematics problems. Responses will be coded so that higher values indicate greater anxiety and standardized within educational level.
STEM aspirations. This outcome will be constructed from survey items measuring students’ interest in pursuing further study or employment involving science, technology, engineering, mathematics, or programming. Items will be coded so that higher values indicate stronger STEM-related aspirations and combined into a standardized index within educational level.
Behavioral curiosity. Students respond to five STEM-related prompts and, after each prompt, choose whether to view an explanation. The principal curiosity measure will be the number of prompts, from zero to five, for which the student chooses to view the explanation. We will also examine the time spent viewing the explanation, conditional on choosing to reveal it.
Computational reasoning. This outcome will be constructed from students’ responses to a grade-appropriate assessment measuring skills such as pattern recognition, analysis of algorithms, and the application of algorithms to solve problems. Correct responses will be combined into an assessment score and standardized within educational level so that higher values indicate stronger computational reasoning. We will examine robustness to scoring assessments based on the count of correct responses and a two-parameter item response model.