Chapter 3: intoduction to statistics the Statistical Process
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3.1 Introduction Statistics
3.1.1 Two branches of Statistics
INTODUCTION TO STATISTICS
The Statistical Process
Plan the Investigation: What? How? Who? Where?
Collect the Sample
A field of
study which implies collecting
, presenting, analyzing and interpreting data
as a basis for explanation
, description and comparison.
used to analyze the results of surveys and as a tool in scientific research to make decisions based on controlled experiments.
Also useful for operations,
, quality control, estimation and prediction.
, or set of individuals or objects or events whose properties are to be analyzed.
a group of subjects selected from the population. Sample is a subset of a population.
: consist a set of recorded observations or values. Any quantity that can have a number of values is variable. Variables whose values are determined by chance are called random variables.
a collection of data values. Each value in the data set is called a data value or a datum.
: a characteristics or attribute that can assume different values.
normally consists of 4 stages:
Collection of data by counting or measuring.
Ordering and presentation of the data in a convenient form.
Analysis of the collected data.
Interpretation of the results and conclusions formulated.
Two branches of Statistics
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