Introduction. What is/are Statistics? Tools for organizing and summarizing data Tests and estimates for generalizations.

Introduction

What is/are Statistics?Tools for organizing and summarizing dataTests and estimates for generalizations

Classification of StatisticsDescriptive StatisticsInferential statistics

Classification of StatisticsDescriptive Statistics

TablesGraphsAveragesRangesCorrelations

Classification of StatisticsInferential statistics

PopulationsProbabilityHypothesis testingz test, T testAnalysis of variance (ANOVA) F-test

SamplingPopulationSampleRandom sampling

Types of DataQualitative

Yes/No, Y/N, 0/1, names, descriptionsQuantitative

numbers

Level of MeasurementNominal

ClassificationOrdinal

RankedInterval/ratio

Equal intervals and true zero

Kinds of VariablesDiscreteContinuous

Types of variablesIndependent

manipulatedDependent

measured

According to the Aug. 13-16, 2007 poll, the vast majority of adults employed full or part-time, 85%, say they generally drive themselves to work. Six percent of workers say they usually ride with someone else to work, 4% take mass transportation, and 3% walk. (Asked of adults who are employed full or part-time) How do you generally get to work -- do you drive yourself, ride with someone else, walk, take mass transportation, or something else?

2007 Aug 13-16

%

Drive yourself 85

Ride with someone else 6

Take mass transportation 4

Walk 3

Something else 1

No answer *

* = Less than 0.5%

Example of Recent Poll and Statistics Used