Data and sampling

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Across
  1. 4. Individuals are selected at regular intervals. (___ sampling)
  2. 7. Data that can be sorted into groups or categories.
  3. 9. Data which can be expressed as numbers.
Down
  1. 1. The population is divided into subgroups and individuals are surveyed within that group. (___ sampling)
  2. 2. A selection or subset of the population.
  3. 3. Each individual in the population has an equal chance of being chosen. (___ sampling)
  4. 5. A tendency which causes a difference in the results of a survey and the true facts.
  5. 6. A complete group with at least one characteristic in common
  6. 8. An investigation or tool to collect information about a given sample or population.