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

By R. Lyman Ott, Micheal T. Longnecker

Facts is a notion approach. during this accomplished creation to statistical equipment and information research, the method is gifted using a four-step strategy: 1) amassing info, 2) summarizing information, three) reading facts, and four) speaking the result of facts analyses.

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Additional resources for An Introduction to Statistical Methods and Data Analysis

Sample text

In those situations that require more complex designs, a professional statistician needs to be consulted to obtain the most appropriate design for the survey or experimental setting. 6. In this situation, there is no interaction. Show that the one-at-a-time approach would result in the experimenter finding the best combination of nitrogen and phosphorus—that is, the combination producing maximum yield. Your solution should include the five combinations you would use in the experiment. 14 The population values that would result from running a 2 ϫ 3 factorial experiment are given in the following table.

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. 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?

The major limitations of the personal interview (aside from the cost involved) concern the interviewers. If they are not thoroughly trained, they may deviate from the required protocol, thus introducing a bias into the sample data. Any movement, facial expression, or statement by the interviewer can affect the response obtained. ’’ may tend to elicit a positive response. Finally, errors in recording the responses can lead to erroneous results. Information can also be obtained from persons in the sample through telephone interviews.