A
Absalom
Guest
In the book Essentials of Marketing Research, William R. Dillon, Thomas J. Madden, and Neil H. Firtle discuss a corporate image study designed to find out whether perceptions of technical support services vary depending on the position of the respondent in the organization. The management of a company that supplies telephone cable to telephone companies commissioned a media campaign primarily designed to:
(1) increase awareness of the company and (2) create favorable perceptions of the company’s technical support. The campaign was targeted to purchasing managers and technical managers at independent telephone companies with greater than 10,000 trunk lines.
Perceptual ratings were measured with a nine-point agree–disagree scale. Suppose the results of a telephone survey of 175 technical managers and 125 purchasing managers reveal that the mean perception score for technical managers is 7.3 and that the mean perception score for purchasing managers is 7.6.
Calculate a 99 percent confidence interval for µ 1 - µ2. Interpret this interval.
(1) increase awareness of the company and (2) create favorable perceptions of the company’s technical support. The campaign was targeted to purchasing managers and technical managers at independent telephone companies with greater than 10,000 trunk lines.
Perceptual ratings were measured with a nine-point agree–disagree scale. Suppose the results of a telephone survey of 175 technical managers and 125 purchasing managers reveal that the mean perception score for technical managers is 7.3 and that the mean perception score for purchasing managers is 7.6.
Calculate a 99 percent confidence interval for µ 1 - µ2. Interpret this interval.