1 Descriptive Stats Slides Worked
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Transcript of 1 Descriptive Stats Slides Worked
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Errata in notes (please make changes)
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Chapter 1 Descriptive Statistics
EG2008 & Alias Modules
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Sexiest Job in 21st Century
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Why learn Statistics
Sexy!!!
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Big Data
“Crunch” Data“Decode”
See patterns= $$$
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Summarise data
• Mean, median, mode, etc.
• Diagrams: histograms, stem & leaf, etc.
• Standard deviation, interquartile range.
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Page 17: Type of variables
Numerical
Non - NumericalNo rankrank
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Page 18: Population vs sample
Population Sample
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So messy!
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Ungrouped
Grouped
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Page 19 : Ungrouped Data
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14
48
24
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Page 20
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• E.g: units of 1 decimal place. • Class boundaries: half a unit = 0.05
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68
11 1310
75
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Page 21: Stem & Leaf
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Page 22: Mean
• Mean = “average” Add the values then divide by the number of values
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Page 22: Median• “Median” = “middle value”
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Page 22: Median• “Median” = “middle value”
4.5
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Typo: please change
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Page 23: Mode
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Page 24: Range, Quartiles
• “Quartiles” = “Quarters”
Question: How to cut a cake into 4 quarters?
Cut ½ then cut ½ again.
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Q1 Q2
Q3
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Page 25: Variance & Standard Deviation
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• Special note: Learn how to use calculator to compute rather than using manual algebra.
• Page 31, 32
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