Chapter 3 Descriptive Statistics: Numerical Measures

11 SlideChapter 3 Descriptive statistics : Numerical Measures2 SlideLearning objectives1. Single variable Part I (Basic) How to calculate and use the Measures of How to calculate and use the Measures of variability2. Single variable Part II (Application) Understand what the Measures of location ( , mean,median, mode) tell us about distribution shape -Discuss its use in manipulating simulated How to detect outliers using z-score and empirical How to use Box plot to explore data How to calculate weighted mean How to calculate mean and variance for grouped data3. Two How to calculate and use the Measures of association-Covariance, Correlation 1. Numerical Measures Part InNumerical measuresnMeasures of Location Mean, median, mode, percentiles, quartilesnMeasures of Variability Range, interquartilerange, variance, standard deviation, coefficient of variation4 SlideNumerical MeasuresIf the Measures are computedfor data from a sample,they are called sample the Measures are computedfor data from a population,they are called population sample statistic is referred toas the point estimatorof thecorresponding population meanof a data set is the average of all the data sampl

2 Slide 3 L.O. 1. Numerical measures –Part I n Numerical measures n Measures of Location •Mean, median, mode, percentiles, quartiles n Measures of Variability •Range, interquartilerange, variance, standard deviation, coefficient of variation Slide 4 Numerical Measures If the measures are computed for data from a sample,

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