Mathematics

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Across
  1. 2. Set of counting numbers include zero
  2. 4. involve asking individuals set of predetermined questions
  3. 6. set of numbers that cannot be written as fraction
  4. 8. involve direct interaction between a Reasercher
Down
  1. 1. Researcher directly observe and record behavior
  2. 3. examination of a single case
  3. 5. Reaserchers manipulate variables.
  4. 7. numbers set of numbers that can be expressed as fraction