Lecture #3 - Descriptive Statistics (1) - Week Three Lecture Graphic Display of Data and Descriptive Statistics Objectives Understand descriptive

# Lecture #3 - Descriptive Statistics (1) - Week Three...

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Week Three Lecture Graphic Display of Data and Descriptive Statistics Objectives Understand descriptive statistics Develop frequency distributions. Calculate measures of central tendency and dispersion. Utilize Microsoft® Excel®’s graphic and tabular techniques to represent descriptive statistical data. Descriptive statistics is a method of organizing, summarizing, and presenting data in an informative way. Two most important methods of data organization and presentation are frequency distribution (tables) and visual display (charts). 1. Creating Frequency Distribution Table A frequency table or frequency distribution is a table containing each category, value, or class of values that a variable might have and the number of times that each one occurs in the data. Rules for Creating Frequency Tables from Raw Data Two questions must be answered to create the frequency table for continuous data. Question 1:How many classes should there be in the table?Question 2:How large (wide) should each class be?1.Decide on the size of class interval
2. Creating Charts from Raw DataThe graphical or visual descriptive tools, which generally include bar charts, pareto charts, pie charts and histograms enable us to summarize data. Examples of charts.
Guidelines for Creating Charts 1.Select the right type of chart for the purpose you want to show.