I need help with these two questions: How can the use of secondary data save a considerable amount of time and resources but limit the use of data analysis possibilities?Are there certain graphs th

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I need help with these two questions: 

  1. How can the use of secondary data save a considerable amount of time and resources  but limit the use of data  analysis possibilities?
  2. Are there certain graphs that we should use for different types of data that will minimize distortion?