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Information and IdeasMediumChoosing data that support a claim about a rate

Information and Ideas practice question

Two villages counted the cars passing through in one hour at 8 a.m. and again after a speed camera was installed in one of them. Village | Before | After Ashby (camera) | 640 | 410 Brook (no camera) | 580 | 560 The parish council argues that the camera diverted traffic away from Ashby, noting that ____

Which choice most effectively uses data from the table to complete the statement?

  1. A. Ashby's count fell from 640 to 410 while Brook's, with no camera, was almost unchanged.Correct
  2. B. Brook's count fell from 580 to 560.
  3. C. Ashby had 640 cars before.
  4. D. both villages had fewer cars afterwards.

Answer: A. Ashby's count fell from 640 to 410 while Brook's, with no camera, was almost unchanged.

A large fall with the camera; near-none without.

Why the other answers are wrong

B. Brook's count fell from 580 to 560.
The control village's tiny change alone shows nothing about Ashby.
C. Ashby had 640 cars before.
One figure.
D. both villages had fewer cars afterwards.
True, but hides the contrast.

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