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Squared or absolute?

Exercise and reference answers

Items
  1. Item
    Mean deviation about the mean
    Category
    Uses absolute values
  2. Item
    Mean deviation about the median
    Category
    Uses absolute values
  3. Item
    M.D.(a)
    Category
    Uses absolute values
  4. Item
    Variance
    Category
    Uses squared values
  5. Item
    Standard deviation
    Category
    Uses squared values
Categories
  1. Item
    Uses absolute values
  2. Item
    Uses squared values

Explanation

Mean deviation takes absolute values; variance squares them. That single choice separates the two families. Source: syllabus Maths, Ch 13 Statistics.
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