STATISTICS

STATISTICS

1. 1. DEFINITIONS

   • Qualitative data
     • Cannot be expressed as a number and cannot be measured
   • Quantitative data
     • data can express in number form and can be measured
   • Discrete data
     • can countable and exact value
   • Continuous data
     • Can assume all values between any two exact values (values in decimal places)
   • Grouped data
     • data given in intervals
   • Ungrouped data
     • data given not in intervals

2. 2. DATA IN TABULAR FORM

   • Grouped data
   • Ungrouped data

3. 3. DATA IN GRAPHICAL FORM

   • Pie chart
   • Bar chart
   • Histogram
     • Using lower and upper class boundary
     • Using midpoint
   • Frequency polygon
     • -From histogram
     • x-axis=midpoint y-axis=frequency
   • Ogive
     • x-axis= upper boundary y-axis=cumulative frequency

4. 4. MEASURES OF CENTRAL TENDENCY

   • Ungrouped data
     • mode
       • Occurs most frequently in set of data
     • mean
     • median
       • data with frequency
       • data with no frequency
   • Grouped data
     • mean
     • mode
       • Find from histogram
     • median
       • Find from ogive
       • Find from formula

5. 5. MEASURE OF DISPERSION

   • Ungrouped data
     • Range
       • largest number - smallest number
     • Interquartile range
       • Third quartile - first quartile
     • variance
     • standard deviation
   • Grouped data
     • Range
       • midpoint of last class - midpoint first class
     • Interquartile range
       • From ogive, find first quartile and third quartile. Then, calculate the difference of third quartile and first quartile
       • Using Formula
     • Variance
     • Standard of deviation

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