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ARC-Easy / MCAS_1999_8_28 / A scientist is studying the effect of acid rain on oak trees. Of the numbers…

Problem

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question

A scientist is studying the effect of acid rain on oak trees. Of the numbers below, which would be the number of oak trees the scientist should use to obtain the most reliable data?

choices

  • 1
  • 2
  • 20
  • 200

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