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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– 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”.
Histograms (Example)
• http://www.cyber-wit.com/gallery_histogram.html#histogram
Copy Figure 2-8 into Notebook
• Mound-shaped Symmetrical• Typical Uniform• Skewed Left• Skewed Right• Bimodal
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)
Do Now
• Using the NFL Touchdown Data from 2011, complete the frequency distribution.
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
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.
Do Now:
1. Display Homework2. Download Weekly Hershey Stock
Prices from my Wikisite and create a histogram of the prices.
Do Now
• Display your homework• Download Class of 2012 Math PSAT
scores from my wikisite
Do Now
• Download NFL Touchdowns for Histograms– Using number of touchdowns:
1. Create a histogram of bin width 102. Create another histogram having 8 bins
Quiz Directions
• Download Eagles Roster from wikisite– Using the weights:1. Create a histogram with 6 bins2. Create a histogram with bin width of
30 (starting at minimum weight).
Do Now
• Click on the link “USA Today Snapshots” from my wikisite.
• Click through the four tabs (News, Sports, Money, and Life)
• Find one bar graph of interest and one pie chart of interest. Record at least two interesting facts from each (for a total of 4).
Bar Graphs and Circle Graphs
• Both show qualitative data.• Pie Charts are only used when you
are representing “parts of a whole” and when selections are made in only one category.
• Paretto Charts are Bar Graphs organized from greatest to least.
Now:
• Download the Eagles Roster (again) from my wikisite. Which variables are qualitative?
Do Now
• Copy important information from the blue box on page 59 into your notebook.
• Display Homework (attempted pie graph of Eagles Positions)
Practice
• Page 60 #1, 5, 8
Do Now
1. Download 100 meter dash data set from wiki.
2. Compare your homework with mine.– Titles?– Labels?
Survived Died Survived DiedFemale Male
Gender
0
100
200
300
400
500
600
700
Titanic Disaster
Third ClassSecond ClassFirst Class
Num
ber
of
People
Quiz (download 2-2 quiz data)
• Using “Phillies Winning Percentage”:– Create an adequately labeled graph that best
represents the data.
• Using “Buying Music Online” data set:– Choose an adequately labeled Paretto or Pie
graph to display the data. (You will need to choose the correct option.)
• Transfer both graphs to Word and display on one page.