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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 - PowerPoint PPT Presentation
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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_hist
ogram.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 Now1. 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 P
eopl
e
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.