Easy as Pi

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Across
  1. 4. closeness to the exact value
  2. 5. number of dollars Bobby's penguin costed
  3. 9. closeness of data sets
  4. 10. position of given amount in dimensional analysis
  5. 12. Fibonacci's first name
  6. 13. what was Bobby trying to buy
  7. 14. means traveler or goof-for-nothing
  8. 15. the number value aimed for in accuracy
Down
  1. 1. first number of the Fibonacci sequence
  2. 2. visual way to convert units
  3. 3. where Mr. Byrd works
  4. 6. formula used to help Bobby
  5. 7. shape of Fibonacci sequence when graphed
  6. 8. Italian merchant who wrote Liber Abaci
  7. 11. month of Fibonacci day