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By R. Lyman Ott, Micheal T. Longnecker

Information is a inspiration technique. during this complete creation to statistical tools and knowledge research, the method is gifted using a four-step procedure: 1) amassing facts, 2) summarizing info, three) examining information, and four) speaking the result of information analyses.

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A. Identify the items that were observed in order to obtain the sample measurements. b. Identify the measurement made on each item. c. Clearly identify the population associated with the survey. d. What characteristic(s) of the population was (were) of interest to the pollster? e. Does the article explain how the sample was selected? f. Does the article include the number of measurements in the sample? g. What type of inference was made concerning the population characteristics? h. Does the article tell you how much faith you can place in the inference about the population characteristic?

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?

A design having two blocking variables is called a Latin square design. 3. Position RF RR LF LR Car 1 Brand Brand Brand Brand A B C D Car 2 Brand Brand Brand Brand B C D A Car 3 Brand Brand Brand Brand C D A B Car 4 Brand Brand Brand Brand D A B C Note that with this design, each brand is placed in each of the four positions and on each of the four cars. Thus, if position or car has an effect on the wear 30 Chapter 2 Using Surveys and Scientific Studies to Gather Data of the tires, the position effect and/or car effect will be equalized across the four brands.

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