Recall the textbook's discussion of cortisol levels among police officers. Which correlation coefficient might a researcher find between cortisol levels and scores on a measure of working memory capacity?

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A negative correlation (e.g., -.35) would indicate that as cortisol levels increase, working memory capacity decreases, which aligns with research suggesting that high stress (indicated by cortisol levels) can impair cognitive functions such as working memory.

Recall the Textbook's Discussion of Cortisol Levels Among Police Officers