By R. Lyman Ott, Micheal T. Longnecker

ISBN-10: 0534251226

ISBN-13: 9780534251222

Records is a suggestion strategy. during this finished creation to statistical tools and knowledge research, the method is gifted using a four-step strategy: 1) accumulating information, 2) summarizing information, three) examining facts, and four) speaking the result of information analyses.

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Extra resources for An Introduction to Statistical Methods and Data Analysis

Example text

Soc. 8 A Yankelovich, Skelly, and White poll taken in the fall of 1984 showed that one-fifth of the 2,207 people surveyed admitted to having cheated on their federal income taxes. Do you think that this fraction is close to the actual proportion who cheated? Why? ) Bus. 9 Two surveys were conducted to measure the effectiveness of an advertising campaign for a low-fat brand of peanut butter. In one of the surveys, the interviewers visited the home and asked whether the low-fat brand was purchased.

The remaining households responded to a longer version of the form containing an additional 45 questions. Many agencies and individuals use the resulting information for many purposes. The federal government uses it to determine allocations of funds to states and cities. Businesses use it to forecast sales, to manage personnel, and to establish future site locations. Urban and regional planners use it to plan land use, transportation networks, and energy consumption. Social scientists use it to study economic conditions, racial balance, and other aspects of the quality of life.

The decrease in tread thickness over the 30,000 miles is the variable of interest in this study. Four different drivers will drive the cars but the drivers are professional drivers with comparable training and experience. The weather conditions, smoothness of track, and the maintenance of the four cars will be essentially the same for all four brands over the study period. All extraneous factors that may affect the tires are nearly the same for all four brands. Thus, the testing agency feels confident that if there is a difference in wear characteristics between the brands at the end of the study, then this is truly a difference in the four brands and not a difference due to the manner in which the study was conducted.

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An Introduction to Statistical Methods and Data Analysis by R. Lyman Ott, Micheal T. Longnecker

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