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Chapter 10_TV - Chapter 10 Graphical Displays of Data Types...

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Chapter 10 Graphical Displays of Data
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Types of Data Categorical Data : a variable is categorical if each observation belongs to one of a set of categories. Example: Hair Color Quantitative Data : a variable that takes on numerical values that represent different magnitudes of the variable. Example: Height
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State if the following variables are categorical or quantitative Religion ______________ Zip Code _____________ Income _______________ Gender _______________ IQ _______________
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Your social security number is ________data A) Qualitative B) Quanitative
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Distribution of Data The distribution of a variable shows us what values a variable an assume and how often each value occurs. The following is the grade distribution for exam #1. Grade A Count or Percent 78 Or 31% B 95 Or 38% C 51 Or 20% D 17 Or 7% F 12 Or 4%
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Graphs for Categorical Data: Bar Graphs and Pie Charts Bar graph shows distribution of the values of a variable. Height of each bar represents percentage (or count) of the whole that each value of the variable assumes. Can compare quantities that are not parts of a whole.
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Bar Graph of Results Exam #1 Results for Stat110 0 10 20 30 40 50 60 70 80 A B C D F
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Pie Charts Show how a whole is divided into parts. Circle represents the whole. Slices represent percentage of the whole that each value of the variable assumes.
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Pie Chart Exam #1 Stat 110 Results 26% 30% 27% 10% 7% A B C D F
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2004 SC PACT Math Results for 6 th Grade Male Female % Below Basic 23.2 19.2 % Basic 38.2 40.5 % Proficient 24.2 26.4 % Advanced 14.1 13.8
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