Question: In a few sentences, explain sentiment classification and why "The battery pack works perfectly and saved my trip!" and "The battery pack died on day one, which was frustrating." belong to opposite sentiment groups.

Sample answer: Sentiment classification is a text analysis task that assigns an attitude label, often positive or negative, to a sentence or review. The first example is positive because phrases like "works perfectly" and "saved my trip" express satisfaction and a helpful outcome. The second example is negative because "died on day one" and "frustrating" describe failure and disappointment. The wording in each sentence reveals the overall tone and therefore its sentiment label.

Key points:

• Sentiment classification labels text by the attitude it expresses
• The first sentence conveys a favorable experience
• The second sentence conveys an unfavorable experience
• Specific wording provides the clue for the label

Rubric: Full credit: clearly explains sentiment classification and justifies both labels using the wording in each sentence. Partial credit: gives the definition but analyzes only one sentence or gives incomplete reasons. No credit: missing or incorrect explanation.