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1 Review For Quiz on Pie Charts Constructing Pie Charts Deconstructing Pie Charts Select Vocabulary from Surveys & Variables

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2 What is a Pie Chart? A pie chart or __________________________ ______________________________________ What is another name for a Pie Chart? _____________________________________

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3 What is a Pie Chart? A pie chart or circle graph has sectors that visually display proportional parts of a total set of data that share a common variable Another name: Circle Graph

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4 4 Pie Chart Characteristics 1.Help________________________________ ___________________________________. 2.Help _________________________________ ____________________________________. 3.Especially useful _____________________. 4.Most effective when ____________________ ____________________________________.

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5 4 Pie Chart Characteristics 1.Help an audience understand distribution of data quickly and easily. 2.Help to see how a total is divided into categories 3.Especially useful with categorical data 4.Most effective when the number of segments is 10 or fewer

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6 Reviewing Variable Types 1. __________ (or __________) 2.__________ (or __________)

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7 Variable Vocabulary: Variables Come in 2 Varieties 1. Categorical (or Qualitative) 2.Quantitative (or Numerical)

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8 Types of Quantitative Variables

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10 Reviewing _________ Variables. 6 Characteristics 1.Recorded usually _________________ 2.Records which of several ___________ _____________ belongs to 3.Count data in each ________, but ______________ should not ________ it 4.Can calculate ____________________ 5.Includes all _____________________ 6.Graphing:______________________

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11 Categorical Variables 1.Recorded usually with words 2.Records which of several groups an individual belongs to 3.Count data in each group, but you logically should not average it 4.Can calculate %age distributions 5.Includes all yes/no questions 6.Graphing: best illustrated with a pie chart

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12 2 Types of Quantitative Variables 1.__________If the Q variable is a set of isolated points on the number line, we call it this. (i.e., it’s a number but it only comes in certain values). Can be counted 2.__________If the Q variable forms an entire interval along the number line, we call it this. (i.e., it’s a number & it can be any value). Can be measured

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13 2 Types of Quantitative Variables 1.DiscreteIf the Q variable is a set Quantitativeof isolated points on the number line, we call it this. (i.e., it’s a number but it only comes in certain values). Can be counted 2.ContinuousIf the Q variable forms an entire Quantitativeinterval along the number line, we Variablecall it this. (i.e., it’s a number & it can be any value). Can be measured Variable

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14 Vocabulary from Surveys 1.Define a Population in a statistical sense: _______________________________ 2.Define Data in a statistical sense: ________________________________

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15 Vocabulary from Surveys 1. Define a Population in a statistical sense: A population is an entire collection of individuals or objects about which information is desired. 2. Define Data in a statistical sense Data are numbers collected in a particular context. During a survey, the interviewer collects it. It always has units.

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16 Vocabulary from Surveys 1.What is good data? _______________________________ 2.What is bad data? ________________________________

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17 Vocabulary from Surveys 1. Good Data in a statistical sense Good Data is the result of intelligent effort and good random sampling methods. 2. Bad Data in a statistical sense Bad Data are the result of laziness, lack of understanding, the desire to mislead others or bad sampling methods.

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18 End Review for Quiz

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19 Classwork & Homework Use the terms you’ve learned to deconstruct pie charts Answer some the ‘usual’ questions about the nature of the survey using the data and your powers of analysis.

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21 Grape Crush Survey

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22 Grape Crush Survey

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24 Deconstruction of Pie College Profs Time

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25 Deconstruction of Pie College Profs Time

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26 Answering ?s About Profs What is question to answer? What is the population? Describe the sample: numbers, units other description Variables? Q or C? Units or 2 categories Conclusions?

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27 Answering ?s About Profs What is question to answer? –In teaching What is the population? –Typical college professors Describe the sample: numbers, units other description –‘an average’ college professor Variables? Q or C? –Time; Categorical Units or 2 categories –Teaching, consulting, research, growth, comm serv, etc Conclusions? –Most time is spent in teaching

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28 Broadband Market Share

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29 Broadband Companies

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30 Broadband Companies

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31 Quiz #102 Test Taking Strategies What you need: –Graphing Calculator –Protractor –Compass –Pencil –Eraser HW to the HW Box How you take test: –Answer Vocabulary –Then do #2 Deconstruction –Then do #1 Construction of graph WATCH THE TIME— This test is longer

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