1STAT 2000Sections 2.1-2.24Exploring Data with Graphs Statistics: The Art and Science of Learning from DataAgresti-FranklinTwo Types of VariablesCategorical VariableValues indicate categoriesEx: What class are you in? Fr,So,Jr,SrQtit tiVi blQuantitative VariableValues are numerical; they have measurement units like minutes, dollars, etc.Ex: How many hours are you taking this semester?Two Types of Quantitative VariablesDiscreteTakes on distinct values on a number line.Ex: The number of people waiting in a line.Ex: 3-way light bulbContinuousCan take on all values in an interval on a number line.Ex: the amount of time a person waits in line.Ex: dimmer switchVariableCategoricalQuantitativeDiscreteContinuousTypes of VariablesIn general (but not always):Discrete – something you countContinuous – something you measureFrontier Airlines Flight 5513:55pm Atlanta, GA (ATL) 5:20pm Denver, CO (DEN) 3hrs 25min-Nonstop$475per personDelta Air Lines Flight 9453:02pm Atlanta, GA (ATL) 4:22pm Denver, CO (DEN) 3hrs 20min-Nonstop$476per personMidwest Airlines Flight 108 / 5275:00pm Atlanta, GA (ATL) 7:55pm Denver, CO (DEN) 4hrs 55min-1 StopChange planes in Milwaukee, WI $485per person(MKE)US Airways Flight 3810 operated by US AIRWAYS EXPRESS-AIR WISCONSIN / Flight 6129 operated by United10:40am Atlanta, GA (ATL) 3:39pm Denver, CO (DEN) 6hrs 59min-1 StopChange planes in Philadelphia, PA (PHL)$485per personUS Airways Flight 8042 operated by America West Airlines / Flight 5379operated by MESA AIRLINES DBA AMERICA WEST EXPRESS5:05pm Atlanta, GA (ATL) 10:23pm Denver, CO (DEN) 7hrs 18min-1 StopChange planes in Phoenix, AZ (PHX)$510per personSample of flights from Atlanta to DenverSubjects What is being studied?VariablesWhich of the following vary?Identify the variables as Categoricalor Quantitative. IfQtit tiidtifdittiIf Quantitative, identify as discreteor continuous.Departure cityAirlineNumber of stopsTravel timePrice
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