Stadistics

Stadistics

1. Concepts

   • stadistics
     • Measure to describe a sample
   • Parameter
     • Measure to describe a population
   • Sample
     • Part of the population
   • Population
     • Total of elements

2. Random variables

   • Quantitative
     • Continuos
       • Measurements
     • Discrete
       • Numerical
   • Qualitative
     • Categorical responses

3. Measurements scales

   • Nominal
     • Descriptive category
   • Ordinal
     • Respective value of things or places
   • Interval
     • tempertaure
   • Ratio
     • Absolut value = 0

4. Measure of position

   • Formulas
     • Px=(x) total of elements data
     • Upper value= Px + 1
     • z-core

5. Measure of dispertion

   • Standar diviation
   • Chevysehv´s teorem
   • Coefficient of variation

6. Sampling methods

   • Probability
     • Multistage
       • Combination of methods
     • Simple random
     • Stratified
       • Divided in groups and random select people from each one
     • Cluster
       • Divided in groups and select only one specific group
     • Sytematic Random
       • List of members and select one by one
   • Non-Probability
     • Voluntary
     • Convenience

7. Visual Display of data

   • type of display´s
     • Histogram
     • Line Graph
     • Circle Graph
     • Bar Graph
   • Frecuency
     • total elemnts of times that event occurs
   • Relative Frecuency
     • Fraction or porcentage of the data represent
   • Grouped frecuency distribution
     • Make from 2-8 doors