Question

review the claim and the two pieces of evidence. chewing gum can improve our alertness and lower our stress level. evidence a: 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. evidence b: 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. why is evidence a stronger than evidence b? evidence b does not come from a credible source. it is based on the opinion of one person who is not an expert and has not done research. evidence b does not directly support the claim. it does not discuss whether chewing gum increases alertness and lowers stress.

Explanation:

Evidence A is from a study with multiple participants, which is more reliable. Evidence B is just one - person's opinion without research support, making it less credible.

Answer:

Evidence B does not come from a credible source. It is based on the opinion of one person who is not an expert and has not done research.