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Chapter 2 Organizing Data

Chapter 2 Organizing Data. Section 2.1. Frequency Distributions, Histograms, and Related Topics. Do Now. Using the chart on the board, place a tally mark in two spots: The number of letters in your first name The number of letters in your last name

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Chapter 2 Organizing Data

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  1. Chapter 2 Organizing Data

  2. Section 2.1 Frequency Distributions, Histograms, and Related Topics

  3. Do Now • Using the chart on the board, place a tally mark in two spots: • The number of letters in your first name • The number of letters in your last name • Ex: My first name is Mark, so I’d put a tally mark at “4”. My last name is Frew, so I’d put an additional tally mark at “4”.

  4. Histograms (Example) • http://www.cyber-wit.com/gallery_histogram.html#histogram

  5. Copy Figure 2-8 into Notebook • Mound-shaped Symmetrical • Typical Uniform • Skewed Left • Skewed Right • Bimodal

  6. Basic Steps for Creation by Hand • Determine the Number of Classes • Determine Class Width • Determine Class Boundaries • Tally • Find Relative Frequencies • Find Midpoints • Graph (X axis = # Line, Y Axis = Freq or Rel. Freq)

  7. Do Now • Using the NFL Touchdown Data from 2011, complete the frequency distribution.

  8. Steps in Excel: • Be sure Data Analysis Toolpack is installed • To Let Excel Decide on Bins: • Choose Data, Data Analysis, Histogram • Input Range is your data range. • Click Label if you have a title for your data. • Click Chart Output. • To make bars touch, click into white space on histogram:choose chart tools, design, chart layout #8 • Be sure to fix titles and labels

  9. Steps in Excel: • To have User Defined Bins: • Next to your data, type the right endpoint of each of your bars, with the exception of the last bar. • Choose Data, Data Analysis, Histogram • Input Range is your data range. • Bin Range is your right endpoints. • Click Label if you have a title for your data. • Click Chart Output.

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