Statistics

Statistics

1. Basic concepts

   • Quantitative (numbers)
     • Continues (Messures)
     • Discrete (counts)
   • Qualitative (qualities)

2. Mesurment scales

   • Qualitative
     • Nomial (All posible options)
     • Ordinal (Ordered options, + to -
   • Quantitative
     • Interval (0 is just another value)
     • Ratio (0 is the las value)

3. Sampling methods

   • Probability
     • simple (Random)
     • Systematic (1 every 4)
     • Stratisfied (divided in groups)
     • Cluster (Randomly selecting groups)
   • Non-probabilty
     • Quota (selected group)
     • Convenience (Select a group expecting something)

4. Visual display of data

   • Frequency= times it happend
     • Relative frequency= times/total
   • Circle
   • Line
   • Bars
   • Histogram

5. Messures of central tendency

   • Mean (average)
   • Median (value in the middle)
   • Mode (repeted)

6. Messures of dispertion

   • Standard deviation (S=√ €(x-Xl)^2/n-1
   • Chevy Shevs (!-1/k^2)
   • X-score (Decite, Quartile, Percentile and Box plot)

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