STATISTICS

STATISTICS

1. Basic Concepts

   • population: is the totality of the elements or things under consideration.
   • sample: the portion of the population that is selected for analysis.
   • Qualitative: produce categorical responses,
   • . Quantitative: produce numerical answers

2. Measurement Scales

   • Qualitative
     • nominal
       • descriptions with no order
     • ordinal
       • descriptions with order
   • Quantitative
     • interval
     • ratio

3. Sampling Methods

   • nonProbability
     • cuota: cluster with certain characteristics
     • Convenience: cuando te conviene
   • Probability
     • simple
       • random
     • systematic
       • with rule; one yes one no
     • stratisfied
       • you divide by types
     • Cluster:
       • bunch of elements

4. Visual Displays of Data

   • Displays
     • Histogram
     • Stem and leaf
     • Bar Graphics
     • Circle Graphics
     • Line Graphics

5. Measures of central Tendency

   • mode
     • the number of times the most popular come
   • mean : average
   • weighted mean
   • median: in the middle of ordered data

6. Measures of dispertion

   • range= mayor-minor
   • standard deviation
     • data-mean^2<--sum<--raiz

7. Measures of position

   • z-score
   • decile
   • quartile
   • percentile