# Week 3 Descriptive stats

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Published on February 1, 2008

Author: physioactive

Source: authorstream.com

Descriptive Statistics:  Descriptive Statistics Chee-Wee Tan Module P1112 What are descriptive statistics?:  What are descriptive statistics? Summarising data Spotting patterns 6186458166186458164563816458163456184658164516465 Case Study:  Case Study Drink kryptonite -- More push-ups? 1 6 1 2 6 1 2 2 10 3 4 9 4 5 7 5 6 6 6 2 6 6 9 7 7 8 8 9 9 3 3 10 2 1 10 2 10 10 10 6 6 6 9 Histogram:  Histogram Distributions:  Distributions Normal Distribution Skewed Distributions:  Skewed Distributions Positively skewed Negatively skewed Kurtosis:  Kurtosis Leptokurtic distribution platykurtic distribution Measures of Central Tendencies:  Measures of Central Tendencies Mode Used with nominal data Bimodality may be messy to deal with. Measures of Central Tendency:  Measures of Central Tendency Median 1 1 1 1 2 2 2 2 2 2 3 3 3 4 4 5 5 6 6 6 6 6 6 6 6 6 6 7 7 7 8 8 9 9 9 9 9 10 10 10 10 10 10 Measures of Central Tendency:  Measures of Central Tendency Mean Can be used in interval and ratio data Measures of Dispersion:  Measures of Dispersion Range 60% Measures of Dispersion:  Measures of Dispersion How much cleverer am I? Squaring deviations:  Squaring deviations 42 = 16 (- 4)2 = 16 Add up all (deviations)2 Number of scores we have (N) = Variance (N-1) used to divide instead of N Field A. (2003) How to Design & Report Experiments’, Sage Publications, London, p129. Standard Deviation:  Standard Deviation Push-up squared? Square-root of variance = standard deviation Presenting our statistics:  Presenting our statistics The mean number of push-ups for kryptonite drinkers is 5.7 push-ups (S.D. = 3.01) Or, Non-kryptonite drinkers did less number of push-ups (M = 2.0, S.D. = 2.7) than kryptonite drinkers (M = 5.7, S.D. = 3.01). Presenting our statistics:  Presenting our statistics Or we could portray this information using a graph, something like this… Summary:  Summary Distributions Measures of central tendency Measures of dispersion Using graphs Remember to read the directed reading!

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