2.1

  • Percentile (%tile)

    • Percent of values in a distribution that are less than the individual data value

    • Percentiles are specific locations within a distribution

    • Say you are at the percentile instead of saying in the percentile

    • Reported as whole numbers

    • High percentiles are not always good


  • Marias test score is at the 48%tile. Interpret the value. What score did she earn.

    • Total scores =25 therefor .48(25)= 12

    • Maria scored higher than 12 people

    • Count fr6 bom left 12 dots to get Maria’s score therefor Maria scored 80 on test


  • Standardized score

    • Z score, tells you hogw many standard deviations from the mean the data value falls and what direction

    • Z= data value - mean = x - x̄

      Stdev = sx