III。Descriptive statistics: Numerical display of data distribution also known as Exploratory Data Analysis (EDA)
1, Shape: symmmetric and skewed 2, Center:central tendency mean median mode 3, spread: variability or dispersion range variance standard deviation percentile and quartile 4. Choose appropriate measures of descriptive statistics based on shape 5. Choose appropriate measures of descriptive statistics based on levels of measurement Norminal measurement Ordinal measurement Interval and ratio measurements IV. Descriptive statistics : Graphical display of data distribution Histogram stem-and-leaf plot box plots