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Week 03 - Tuesday (February 14)

• Which of the following is a characteristic of a tidy data frame?

  • A. Variables correspond to rows.
  • B. Columns may correspond to multiple variables.
  • C. Values are what is stored on the inside of the data frame.
  • D. Observational units are stored in the columns.
    

• Is this data set from the Pew Research Center in tidy data format?

  • A. Yes
  • B. No

• What is the observational unit in the police_locals data frame?

  • A. Percentage of officers
  • B. Police force
  • C. Race
  • D. City
    

• What is the appropriate definition of “observational unit”?

  • A. A characteristic being measured about an object.
  • B. The unit within a row that is being observed via the columns.
  • C. The result of rows and columns creating a table.
  • D. None of the above.