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662746042.ppt - Charts and Graphs Dr Sanjay Rastogi IIFT...

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Dr. Sanjay Rastogi, IIFT, New Delhi Charts and Graphs
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Dr. Sanjay Rastogi, IIFT, New Delhi Ungrouped Versus Grouped Data Ungrouped data have not been summarized in any way are also called raw data Grouped data have been organized into a frequency distribution
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Dr. Sanjay Rastogi, IIFT, New Delhi Example of Ungrouped Data 42 30 53 50 52 30 55 49 61 74 26 58 40 40 28 36 30 33 31 37 32 37 30 32 23 32 58 43 30 29 34 50 47 31 35 26 64 46 40 43 57 30 49 40 25 50 52 32 60 54 Ages of a Sample of Managers from Urban Child Care Centers in the United States
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Dr. Sanjay Rastogi, IIFT, New Delhi Frequency Distribution of Child Care Manager’s Ages Class Interval Frequency 20-under 30 6 30-under 40 18 40-under 50 11 50-under 60 11 60-under 70 3 70-under 80 1
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Dr. Sanjay Rastogi, IIFT, New Delhi Number of Classes and Class Width The number of classes should be between 5 and 15. Fewer than 5 classes cause excessive summarization. More than 15 classes leave too much detail.
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