Information and IdeasVery hardSelecting the data that distinguish two explanations
Information and Ideas practice question
A school compared two classes' test results before and after one class switched to a new textbook.
Class | Before | After
Class A (new book) | 62 | 71
Class B (old book) | 61 | 69
A teacher cautions that the new book's effect is unproven, noting that ____
Which choice most effectively uses data from the table to complete the statement?
- A. Class B, which kept the old book, improved by 8 points, nearly as much as Class A's 9.Correct
- B. Class A improved from 62 to 71.
- C. Class A scored 71 after.
- D. both classes started at about 60.
Answer: A. Class B, which kept the old book, improved by 8 points, nearly as much as Class A's 9.
A 9-point gain against an 8-point gain without the book: little to credit the book with.
Why the other answers are wrong
- B. Class A improved from 62 to 71.
- Class A's gain alone suggests the book worked.
- C. Class A scored 71 after.
- One figure.
- D. both classes started at about 60.
- True, but shows nothing about the effect.
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