CHAPTER 1 – INTRODUCTION TO STATISTICS
Definition:
Statistics is the science of collecting, organizing, presenting, summarizing and analysing raw data in order to obtain useful information for decision making.
Quantitative Variable:
Variable studied which can be measured or counted.
Qualitative Variable:
Non-numeric variable / numerical measurement is not possible.
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CHAPTER 2 – DATA PRESENTATION
Range is the difference between the highest and lowest score (Range= ymin-ymax)
Sturge’s rule also can be used to determine the number of classes in a histogram or frequency distribution table.
Determine the class size (class interval). Generally the class size should be the same for all classes.
CHAPTER 3 – MEASURE OF CENTRAL TENDENCY
* THE FORMULAE FOR
- MEAN ,
- MODE
- MEDIAN
CHAPTER 4 – MEASURE OF DISPERSION
*THE FORMULAE FOR
- RANGE, r
- MEAN DEVIATION,
- VARIANCE, AND
- STANDARD DEVIATION,
(FOR UNGROUPED DATA)
*THE FORMULAE FOR
- VARIANCE, AND
- STANDARD DEVIATION,
(FOR GROUPED DATA)
