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Across
  1. 2. something that can cause health problems or death
  2. 3. one who has no worries
  3. 4. person that doesn't have money
  4. 7. food that was left for too long and cannot be eaten anymore
  5. 9. something that doesn't have something multiple meanings
  6. 11. place where something is produced
  7. 12. one that cannot be avoided
  8. 13. it is calculated by summing up the values for observations and dividing by number of observations
Down
  1. 1. put forward arguments to make someone change their mind
  2. 5. make smaller
  3. 6. make something not clear
  4. 7. finish till the end (i.e. resources)
  5. 8. effect
  6. 10. without contamination