This document provides an overview of key concepts in descriptive statistics including:
- Parameters describe populations while statistics describe samples
- Measures of central tendency include the mean, median, and mode
- Measures of variation/dispersion include range, variance, standard deviation, and coefficient of variation
- The empirical rule and Chebyshev's theorem describe how data is distributed around the mean
- Z-scores and percentiles relate individual values to the overall distribution
24. Measures of Variation 10.0 9.3 8.5 7.7 7.7 6.7 6.2 5.8 5.4 4.2 Bank of the USA 7.7 7.7 7.7 7.4 7.3 7.1 6.8 6.7 6.6 6.5 First Valley Bank Midrange Mode Median Mean Bank of the USA First Valley
25. Back-to-Back Stem & Leaf Plot First Valley Bank Bank of the USA 10.0 9.3 8.5 7.7 7.7 6.7 6.2 5.8 5.4 4.2 Bank of the USA 7.7 7.7 7.7 7.4 7.3 7.1 6.8 6.7 6.6 6.5 First Valley Bank
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27. Measures of Variation Standard Deviation Range 75 75 75 75 Mean 90 77 0 75 80 76 100 75 70 74 100 75 60 73 100 75 Student D Student C Student B Student A
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