STATISTICS

STATISTICS

1. Measures of Position

   • z-score
   • Percentile
   • Quartile
   • Decile

2. Measures of Dispersion

   • Standar Deviation
   • Coefficient of Variation
   • Chevyshev´s Theorem

3. Measurement Scales

   • INTERVAL
     • satisfies the identity, equal intervals and magnitude properties
   • NOMINAL
     • Only satisfies the identity property
   • P. of MEASUREMENT
     • Equal Intervals
     • Magnitude
     • Identity
     • Minimum Value of Zero
   • ORDINAL
     • satisfies the identity and magnitude properties
   • RATIO
     • satisfies the four properties

4. Basic Concepts

   • Parameter
     • Is a measure of overview that is calculated to describe a characteristic of a population
   • Statistic
     • Is a measure of overview that is calculated to describe a characteristic of a simple sample of the population
   • Sample
     • Portion of the population that is selected for the analysis
   • Population
     • Totally of things under consideration
   • Random Variables
     • Quantitative random variables
       • Discrete
       • Continius
     • Quantitative random variables
       • Categorical responses to describe an element in a population

5. Visual Displays of Data

   • Line Graph
     • Bar Graph
       • Circle Graph
         • Displays
           • Steam an Leaf
             • Histogram
   • Frequency Distribution
     • Relative Frequency
     • Frequency

6. Sampling Methods

   • Non-Probable
     • Voluntary
     • Convenience
   • Probability Sample
     • Cluster
       • Every member of a population is assigned to one and only group
     • Satisfied
       • Population divided in groups by characteristics
     • Simple
       • If all possible samples on N objets are likely to occur
     • Systematic
       • Create a list of every member of population
   • Population Parameter
     • True value of population attribute
   • Sample Static
     • Estimate based on sample data of population parameter