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STA1610 Study Unit 01Data and Statistics
P Sebatjane January 19, 2021
,Overview
1 Overview
2 Definition of Statistics
Descriptive Statistics
Inferential Statistics
3 Key Terms
4 Variables
5 Scales of Measurements
Nominal Scale
Ordinal Scale
Interval Scale
Ratio Scale
6 References
P Sebatjane STA1610 Study Unit 01 19th January 2021
,Definition of Statistics
Statistics is concerned with collection, processing, analysis,
interpretation and presenting of data to assist decision makers.
1 Collecting, summarizing and presenting data is called
descriptive statistics. Such summaries may be graphical,
numerical or tabular.
2 Once you have studied probability and probability distributions,
you will use formal methods for drawing conclusions from your
data. These formal methods are called inferential statistics.
Statistical inference uses probability to determine how
confident we can be in drawing conclusions about a population
based on a sample.
P Sebatjane STA1610 Study Unit 01 19th January 2021
, Descriptive Statistics
Collect data e.g. Survey
Present data e.g. Tables
Interpret data e.g. Graphs
P
X̄
Characterise data e.g. Sample Mean = n
P Sebatjane STA1610 Study Unit 01 19th January 2021
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