abc

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Across
  1. 2. Unpredictable; happening by chance (6)
  2. 3. A specific result of an experiment (7)
  3. 6. A collection of one or more outcomes (5)
  4. 7. A single performance of an experiment (5)
  5. 8. Outcomes we want to occur (9)
Down
  1. 1. Based on actual experiments (12)
  2. 4. Based on logic, not experiments (11)
  3. 5. All possible results of an experiment (6,5)