Plicker Questions from class


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.