16Hit1600
Information and IdeasVery hardReading a table of errors with an untrained comparison line

Information and Ideas practice question

Errors per 1,000 parts Line | Before | After 1 (trained) | 20 | 8 2 (not trained) | 22 | 18 A manager argues that the training worked, since ____

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

  1. A. Line 1's error rate fell by 12 per 1,000 while the untrained line's fell by only 4, so most of Line 1's improvement cannot be explained by whatever lowered errors on both lines.Correct
  2. B. Line 1's error rate fell to 8 per 1,000.
  3. C. Line 2's error rate also fell.
  4. D. Line 1 had fewer errors than Line 2 both before and after.

Answer: A. Line 1's error rate fell by 12 per 1,000 while the untrained line's fell by only 4, so most of Line 1's improvement cannot be explained by whatever lowered errors on both lines.

Twelve against four.

Why the other answers are wrong

B. Line 1's error rate fell to 8 per 1,000.
Ignores the comparison line.
C. Line 2's error rate also fell.
A point that, alone, weakens the claim.
D. Line 1 had fewer errors than Line 2 both before and after.
True, but not about the change.

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