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For a large document containing many repeated phrases, which compression technique is most effective to reduce file size without losing data?

hard🚀 Application Q8 of Q15
Intro to Computing - How Data is Represented
For a large document containing many repeated phrases, which compression technique is most effective to reduce file size without losing data?
ADictionary-based compression (e.g., LZW)
BLossy compression (e.g., JPEG)
CRun-length encoding only
DEncrypting the file
Step-by-Step Solution
Solution:

  1. Step 1: Identify compression needs

    We want to reduce size without losing data.

  2. Step 2: Evaluate methods

    Lossy compression loses data, so B is incorrect. Run-length encoding is less effective for phrases.

  3. Step 3: Choose dictionary compression

    Dictionary methods replace repeated phrases with shorter codes efficiently.

  4. Final Answer:

    Dictionary-based compression (e.g., LZW) -> Option A

  5. Quick Check:

    Dictionary compression handles repeated phrases well [OK]
Quick Trick: Dictionary compression replaces repeated phrases efficiently [OK]
Common Mistakes:
MISTAKES
  • Choosing lossy compression for text files
  • Assuming run-length encoding is best for phrases
  • Confusing encryption with compression

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