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Assertion (A): A thematic map of a rate should still state the underlying counts somewhere.
Reason (R): A rate computed from very small numbers is unstable and can swing wildly.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason explains why: one extra case in a district of two hundred people moves the rate sharply, so a striking tone may rest on almost no evidence. Reporting the counts lets the reader discount such units.

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