chapter1small

# chapter1small - Section 1.1 How Can You Investigate Using...

This preview shows pages 1–3. Sign up to view the full content.

Section 1.1 How Can You Investigate Using Data? May 11, 2009 1 1 Statistics: The Art and Science of Learning from Data Disclaimer: Unless otherwise stated, all statements in quotes are taken directly from our textbook Agresti/Franklin, 2007. 1.1 How Can You Investigate Using Data? “The information we gather with experiments and with surveys is collectively called data .” Statistics is the art and science of designing studies and analyzing the data that those studies produce. Its ultimate goal is translating data into knowledge and understanding of the world around us. In short, statistics is the art and science of learning from data.” Where is statistics used in the real world? Example: 2000 U.S. Senatorial election in New York, with 6,253,883 voters (out of 19 million New Yorkers, including children). Based on an exit poll from sampling 2232 voters (0.036% of voters): Democrat Hillary Rodham Clinton (56%), Republican Rick Lazio (44%) Is it reasonable to conclude that Clinton won, based on that exit poll? * Yes. { Standard error is about 1%, so margin of error is about 1 . 96 × 1% 2%. Clinton won 55% to 43% with the remaining votes going to third party candidates. } { This is sample surveys. Other examples include estimating unemployment rate, approval of President’s foreign policy in Mexico. } * Yes. { Standard error is about 1%, so margin of error is about 1 . 96 × 1% 2%. Clinton won 55% to 43% with the remaining votes going to third party candidates. } { This

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Section 1.1 How Can You Investigate Using Data? May 11, 2009 2 is sample surveys. Other examples include estimating unemployment rate, approval of President’s foreign policy in Mexico. } Example: Test marketing. Will revenues increase if a company starts marketing a new product? * Around 1985 Coca-Cola changed its formula and called the new product New Coke . * Around 1985 Coca-Cola changed its formula and called the new product New Coke . Example: Suppose there is an 80% chance of rain. * What does this mean? This exempliFes climatology . * What does this mean? This exempliFes climatology . Example: Global warming * { We study global warming via data, see Agresti/±ranklin, chapter 2. } * { We study global warming via data, see Agresti/±ranklin, chapter 2. } * An example regarding average annual temperature in Central Park from 1901 to 1997 is on p. 43.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 7

chapter1small - Section 1.1 How Can You Investigate Using...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online