Area for Ads in the Yellow Pages
Not what you're looking for?
A sample of 20 pages was taken without replacement of the 1591 page phone directory "American Pages Plus Yellow Pages." On each page, the mean area devoted to display ads was measured (a display ad is a large block of multicolored illustrations, maps, and text). The data (in square milimeters) is shown below
0 260 356 403 536 0 268 369 428 536
268 396 469 536 162 338 403 536 536 130
A) construct a 95% confidence interval for the true mean.
B) Why might normality be an issue here?
C) What sample size would be needed to obtain an error of + or - 10 square milimeters with 99% confidence?
D) If this is not a reasonable requirement, suggest one that is. (data are from a project by MBA student Daniel Dalach)
Purchase this Solution
Solution Summary
Word document attached shows how to construct a confidence interval, identify might normality issues and find the required sample size for data on ad space in a phone directory.
Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.