Post on 04-Dec-2015
description
Errata in notes (please make changes)
Chapter 1 Descriptive Statistics
EG2008 & Alias Modules
Sexiest Job in 21st Century
Why learn Statistics
Sexy!!!
Big Data
“Crunch” Data“Decode”
See patterns= $$$
Summarise data
• Mean, median, mode, etc.
• Diagrams: histograms, stem & leaf, etc.
• Standard deviation, interquartile range.
Page 17: Type of variables
Numerical
Non - NumericalNo rankrank
Page 18: Population vs sample
Population Sample
Page 18 ‐ 19
So messy!
Ungrouped
Grouped
Page 19 : Ungrouped Data
14
48
24
Page 20
• E.g: units of 1 decimal place. • Class boundaries: half a unit = 0.05
68
11 1310
75
Page 21: Stem & Leaf
Page 22: Mean
• Mean = “average” Add the values then divide by the number of values
Page 22: Median• “Median” = “middle value”
Page 22: Median• “Median” = “middle value”
4.5
Typo: please change
Page 23: Mode
Page 24: Range, Quartiles
• “Quartiles” = “Quarters”
Question: How to cut a cake into 4 quarters?
Cut ½ then cut ½ again.
Q1 Q2
Q3
Page 25: Variance & Standard Deviation
• Special note: Learn how to use calculator to compute rather than using manual algebra.
• Page 31, 32