Introduction

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

Classification of Statistics Descriptive Statistics Inferential statistics

Classification of Statistics Descriptive Statistics Tables Graphs Averages Ranges Correlations

Classification of Statistics Inferential statistics Populations Probability Hypothesis testing z test, T test Analysis of variance (ANOVA) F-test

Sampling Population Sample Random sampling

Types of Data Qualitative Yes/No, Y/N, 0/1, names, descriptions Quantitative numbers

Level of Measurement Nominal Classification Ordinal Ranked Interval/ratio Equal intervals and true zero

Kinds of Variables Discrete Continuous

Types of variables Independent manipulated Dependent measured

According to the Aug , 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 % Drive yourself85 Ride with someone else6 Take mass transportation4 Walk3 Something else1 No answer* * = Less than 0.5% Example of Recent Poll and Statistics Used