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Statistics

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Statistics

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    1. ©1999 Trustees of Indiana University Statistics Professor Orr CPT120, Quantitative Analysis I

    2. ©1999 Trustees of Indiana University What is “Statistics”? Numeric data that has been collected, processed, interpreted and presented in a way that makes sense Examples: baseball batting averages weather forecasts climatology data such as rainfall amounts, average temperatures marketing information

    3. ©1999 Trustees of Indiana University Factors About Statistics Levels of statistics presented summaries of numeric data advanced mathematical analysis: probabilities Interpreting numbers averages percentages standard deviations relationships between numbers inferences about numbers

    4. ©1999 Trustees of Indiana University Basic Terminology statistics can mean: tabulated numerical data techniques used to process or to analyze data statistician can mean: one who tabulates data (bookkeeper) one who analyzes or interprets data scholars who develop the mathematical theories upon which the science of statistics is based

    5. ©1999 Trustees of Indiana University Growth of Statistics Use of statistics has exploded in the last 50 years More information is presented to the public Wall Street Journal and USA Today Sciences and businesses make use of a “quantitative approach” inventory planning traffic patterns

    6. ©1999 Trustees of Indiana University Quality of Statistical Information Learning about statistics can help you to evaluate the quality & relevance of the information presented Computers allow statistical information to be processed quickly, but do not monitor the quality of the information Statistical information can be biased

    7. ©1999 Trustees of Indiana University Surveys and Statistics Questions asked of people to gather information Generally are costly and labor intensive Effective surveys involve: unbiased questions people affected by a situation questions at the appropriate time and place

    8. ©1999 Trustees of Indiana University Problems with Survey Questions Biased Questions Do you feel that this wasteful program should be stopped? Wrong Time & Place Questions a phone survey about daycare conducted at 9:00 a.m. weekdays

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