presentation2 - CHAPTER 2 Descriptive Statistics:...

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CHAPTER 2 Descriptive Statistics: Organizing, Summarizing, and Graphing Individual Variables
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Organizing our data: A first step in Identifying Patterns When we organize our data which is composed of raw scores, or data that not been analyzed, it is useful to look at the distribution of score. The best and simplest way to arrange our data is to use a frequency table , which is visually displays the data so that we can see how often each value occurs.
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Organizing our data: A first step in Identifying Patterns To create a frequency table. Determine the range of our scores Create two columns, in the first column, add the highest value to the top of the column and the lowest value to the bottom In the second column, mark the number of times each of these values has occurred in our data set
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Frequency table A frequency tables allows us to calculate cumulative percentages, or the percentages of individuals or things that have scores at a given value or lower. Grouped frequency table that displays the frequencies for an interval rather than a specific value.
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Organizing Our Data: A First Step in Identifying Patterns Distributions Four different ways to visually describe just one variable Frequency table Grouped frequency table Frequency histograms Frequency polygon
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data 1,2,7,6,1,2,6,5,4,4,0,3,2,2,3,4,3,5,4,4.
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data 3,3,3,4,5,9,5,3,3,5,6,3,5,6,3,4,8,6,3,3,3,4,4,4,7,6,3,5,5,7,1 3,3,3,3,3,3,4,4,4,5,6,7,6,7,8,8,3,3,3,5,3,3,5,3,3. There are 54 graduate advisors who had had at least three former PHD students go on to jobs as professors in departments ranked in the top 50 chemistry departments.
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Frequency table examine the data; create two columns; in the first column record the values, putting highest at the top and lowest the bottom; Tally the occurrence of each value Record the tallies in the second column
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Grouped frequency table Find the highest and lowest scores; Use the full range of data, but round scores down to whole numbers Determine number of intervals and best interval size
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presentation2 - CHAPTER 2 Descriptive Statistics:...

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