Archive for category Statistics

Rounding Rules of Data

Posted by 1Q8 in Statistics on April 28th, 2009

Rounding is the method of  reducing the number of digits in a number. The result of rounding is a “shorter” number yet similar in magnitude.
When performing data analysis, these questions always come up; When should we round up the answer or when should we round down? How many figures are appropriate?
The following Rules should help [...]

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Type of Variables

Posted by 1Q8 in Statistics on April 27th, 2009

Variable is a characteristic under investigation that assumes different values for different elements. A variable can be classified as a Quantitative and Qualitative.
Type of Variables

Qualitative or Categorical Variable

Qualitative or Categorical or Attribute Variable is the variable that can not be measured numerically, but can be divided into different categories.
For example; gender, religious, place of birth, [...]

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Type of Statistics

Posted by 1Q8 in Statistics on April 26th, 2009

Statistics can be divided into 2 areas: Descriptive Statistics and Inferential Statistics.
Descriptive Statistics
Descriptive Statistics consist of methods for organizing, summarizing, displaying, and describing data(of the population) in an informative way.
A population is a collection of all possible elements of interest.
The informative way to present the data: tables, graphs, calculating summary measures such as averages.
Inferential Statistics
Inferential [...]

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What is Statistics?

Posted by 1Q8 in Statistics on April 26th, 2009

Statistics is the science or a group of method of

Collecting
Organizing
Presenting
Analyzing
and Interpreting

numerical data in order to make more effective decision.
Tips: Statistics = COPAI for decision making!
Why do we use Statistics?
Raw Data collected from the field do not provide the adequate information necessary for quality control or improvement, there for we need to organize, analyze,  and interprete [...]

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