Crossword Mathematics

123456789
Across
  1. 2. It is non-numerical and used to categorize or describe properties
  2. 5. Dividing the population into subgroups (strata).Systematic Selecting every nth individual from a random start.
  3. 7. Researchers manipulate variables to observe the effect on the outcome.
  4. 8. It involves quantities and amounts, and is used to perform mathematical operations
  5. 9. Researchers directly observe and record behavior, without direct interaction.
Down
  1. 1. Direct interaction, where questions are asked and responses are recorded.
  2. 3. The union of two or more sets is the collection of elements belonging to all of the sets.
  3. 4. Asking individuals a set of predetermined questions.
  4. 5. A set each of whose elements is an element of an inclusive set.
  5. 6. The set of elements that are in both set A and B.