Mathematics Crossword

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