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An equal-interval classification divides the data range into

  • A.classes of equal numerical width
  • B.classes holding equal numbers of units
  • C.classes chosen at natural breaks in the data
  • D.classes defined by the standard deviation

Answer: A

Equal interval cuts the range into steps of the same size, which is easy to read but can leave classes empty when the distribution is skewed. Quantile, natural breaks and standard deviation schemes each answer that problem differently.

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