Screening Paper II · 1 General Mental and Psychological Abilities · APPSC Group 1

1.5.1 Basic statistics and growth rates notes

3 notes, in reading order.

  1. 1.5.1.1Mean, median and mode: raw and grouped data

    The mean is the total shared equally, the median is the middle value after sorting, and the mode is the most frequent value; for grouped data each has its own formula built on the class width.

    Advanced · 6 min · Full course
  2. 1.5.1.2Range, variance and standard deviation

    Measures of dispersion tell how spread out the data are around the centre: range uses only the two extremes, while variance and standard deviation use every value.

    Advanced · 6 min · Full course
  3. 1.5.1.3Growth rates: percentage change, CAGR and index numbers

    Growth is always measured against the earlier value: one period gives a percentage change, several periods give a compound annual growth rate (CAGR), and an index number turns any series into "base year = 100".

    Advanced · 6 min · Full course

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