What was the difference in average score gain between the districts? (Passage: Reading aloud)
Teachers in one district began setting aside twenty minutes each day for reading aloud to pupils aged seven to nine. After a year, pupils' vocabulary test scores had risen by an average of 8 points, compared with 3 points in a neighbouring district that had not changed its timetable. The two districts were similar in size and funding. However, the first district also introduced a new phonics programme during the same year, and the researchers could not separate the effects of the two changes.
Answer and explanation
Correct answer: C. 5 points
- Step 1: Subtract. Step 2. 8 - 3 = 5. Answer: 5 points. Why not the others: 3 and 8 are individual gains; 11 adds them.
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