Question

consider this claim: chewing gum can improve our alertness and lower our stress level. which piece of evidence better supports this claim? evidence a: during a class discussion, a student shared that he chewed gum throughout a recent chemistry test because he heard it would help him stay calm and alert. he believed that he did very well on the test as a result. evidence b: in a study of forty participants, those who chewed gum while performing stressful tasks had lower levels of anxiety and higher levels of alertness than those not chewing gum.

Explanation:

Evidence B is from a study with forty participants, providing more scientific and general - applicable data. Evidence A is just an individual's anecdotal experience.

Answer:

Evidence B