Standard Normal Curve & Z-Values

Standard Normal Curve

  • Speaker reiterates the concept of “deviations” on a standardized, standard‐normal curve.
  • Mentions the horizontal axis marked in standard‐deviation units (z‐scores):
    • z=0z = 0 (the mean)
    • z=−1,−2,−3z = -1, -2, -3 (one, two, three standard deviations below the mean)
    • z=1,2,3z = 1, 2, 3 (one, two, three standard deviations above the mean)
  • Emphasizes that these tick marks are the z values used to locate points on the curve.