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

By R. Lyman Ott, Micheal T. Longnecker

Records is a notion method. during this complete creation to statistical equipment and information research, the method is gifted using a four-step method: 1) collecting info, 2) summarizing information, three) studying facts, and four) speaking the result of info analyses.

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Extra info for An Introduction to Statistical Methods and Data Analysis (5th Edition)

Sample text

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. In the other survey, the interviewers asked the person to show them the peanut butter container when the interviewee stated he or she had purchased low-fat peanut butter. a. Do you think the two types of surveys will yield similar results on the percentage of households using the product?

B. A newspaper editor wants to survey the attitudes of the public toward the type of news coverage offered by the paper. c. A city commissioner is interested in determining how homeowners feel about a proposed zoning change. d. A county health department wants to estimate the proportion of dogs that have had rabies shots within the last year. 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.

How to Plan a Survey, How to Collect Survey Data, Judging the Quality of a Survey, How to Conduct Pretesting, What Are Focus Groups? and More about Mail Surveys. These documents describe many of the elements crucial to obtaining a valid and useful survey. They list many of the potential sources of errors commonly found in surveys with guidelines on how to avoid these pitfalls. A discussion of some of the issues raised in these brochures follows. Problems Associated with Surveys survey nonresponse Even when the sample is selected properly, there may be uncertainty about whether the survey represents the population from which the sample was selected.

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