Young Professional magazine was developed for a target audience of recent college graduates who are in their first 10 years of a business or other professional career. The magazine has been fairly successful and the publisher is interested in expanding the publication’s advertising base. As a recent hire into the marketing department at the magazine, you have been asked to help develop a survey asking readers demographic information and questions about their interests. Your survey results will be used to help the magazine choose articles of interest and provide advertisers with a profile of subscribers.

The culmination of your work will be a presentation of your findings to management. Therefore, you not only have to present summary data, but must also be able to explain the results in a manner that is accurate and easy to understand.

Based on the following results of your survey, how confident are you that a majority of the magazine’s subscribers have broadband access?

Variable Yes No N Mean StDev SE mean
BroadBand Access 256 154 410 74459.5 34818.2 1719.5

a. A large degree of confidence: 50.1% (a majority) is at the lower end of the 95% confidence interval for the population proportion.
b. A small degree of confidence; 50.1% (a majority) is at the upper end of the 95% confidence interval for the population proportion.
c. Near certainty; 50.1% (a majority) is far below the 95% confidence interval for the population proportion.
d. Almost zero confidence; 50.1% (a majority) is far above the 95% confidence interval for the population proportion.