Mathematics Crossword

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Across
  1. 3. Involve asking individuals a set of predetermined questions.
  2. 6. Dividing the population into subgroups or strata.
  3. 7. It involves quantities and amounts, and is used to perform mathematical operations.
  4. 9. Direct interaction between a researcher and a participation.
  5. 10. Researchers directly observe and record behavior or events.
Down
  1. 1. It is non-numerical and used to categorize or describe properties
  2. 2. The set containing only elements common to two or more sets (overlap).
  3. 4. Selecting every nth individual from a random start.
  4. 5. Researchers manipulate variables to observe the effect of the outcome.
  5. 8. The set containing all elements from two or more sets (combination).