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Applied Statistics (Unit 4. Deviation Measures (Rank The range measures…
Applied Statistics
Unit 4. Deviation Measures
Rank
The range measures the total propagation in the data series.
Variance and Standard Deviation
The Sample Variance is the average of the square differences between each of the observations in a series of data and the mean.
Definition of Deviation Measures
Although we have the measures of central tendency that indicate the center of a set of data, many times these measures do not show us the reality completely.
The Coefficient of Variation
This coefficient only serves to compare the dispersions of variables corresponding to ratio scales.
Unit 3. Central Tendency Measures
Average or Average
The average is an average. It is calculated by adding all the data and then dividing the total by the number of data involved.
Median
The median is not affected by extreme values.
Definition of Central Tendency Measures
One of the most outstanding features of data distribution is its tendency to accumulate towards the center of it.
Fashion
Fashion is not affected by the occurrence of any extreme value.
Unit 2. Data Collection and Presentation
Boards
Data can be collected in various ways: questionnaires, samples,
censuses, observations, etc.
Basic concepts
• Population
• Sample
• Individual
• Variable
• Census
• Sampling
Graphical Data Presentation - Part A
• Histograms
• Polygons
Graphical Data Presentation - Part B
• Bar charts
• Pie chart
Unit 1. Introduction to Statistics
Statistics Divisions
Traditionally the Statistics is divided into
• Descriptive Statistics
• Inductive Statistics or Statistical Inference
Statistics Applications
Statistics is a powerful auxiliary of many human sciences and activities: sociology, psychology, human geography , economics, and so on.
Statistics History
Simple forms of statistics have existed since the beginning of civilization , as graphic representations and other symbols on skins, rocks, wooden sticks and cave walls were already used to count the number of people, animals or certain things.
What is statistics?
Statistics is the science that studies data sets and their interpretation in mathematical terms .