Abstract
A distractor-rich performance task case study was developed to teach undergraduate analytical chemistry students about standard addition while reinforcing their grasp of data analysis and quality control principles. The performance task presents students with an e-mail from a fictional district attorney that asks them to investigate allegations of data falsification in a crime lab and determine whether fabricated, falsified, or faulty analyses may have impacted one particular court case. It also asks students to suggest changes to the lab’s quality assurance practices. Correct analysis of the task scenario requires students to recognize that the accused analyst systematically overestimated analyte levels when they incorrectly assumed that their standard addition data fell within the linear region of their method’s signal-response curve. The task is also designed to help students to grow in their professional awareness as chemists, critical thinking, and communication skills. This is because students are e...
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