Keywords of Statics

Types of Statistics

1. Inductive statistics, or statical inference :- condition under inference

2. descriptive or deductive statistics.

Variabls:

1. discrete

2. continue

Frequency

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frequance distribution, class interval, class limits, 

class mark : mid point of class

relative frequency distribution : precentage distribution or relative frequency table.  : frequency of class divided by total frequency

cumulative frequency and ogives: total frequency upto class upper boundary.  "or more", "or less"

relative cumulative frequency : cumulative frequency divided by total frequency.

Averages or Measures of Centeral Tendency

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1. Arithmetic mean
2. Median : midle value
3. Mode  : greatest frequency
4. Geometric Mean  : Nth root of multiplication
5. Harmonic mean  : reciprocal arthmatic mean
6. Weighted Arithmetic mean ; arthmatic mean multiply with weight
7. Root Mean Square(RMS) or quadratic mean
8. Quartiles, Deciles and Percentiles

           Mean-mode = 3(mean-median)

The Standard Deviations

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1. Dispersion, Variation of the data
2. Range
3. Mean Deviation
4. Standard Deviation : Root mean square deviation
5. Variance : square of standard deviation

1. Moments
2. Skewness
3. Kurtosis