Chapter 11: Problem 49
The article "Portable MP3 Player Ownership Reaches New High" (Ipsos Insight, June 29,2006 ) reported that in \(2006,20 \%\) of those in a random sample of 1112 Americans age 12 and older indicated that they owned an MP3 player. In a similar survey conducted in \(2005,\) only \(15 \%\) reported owning an \(\mathrm{MP} 3\) player. Suppose that the 2005 figure was also based on a random sample of size \(1112 .\) Estimate the difference in the proportion of Americans age 12 and older who owned an MP3 player in 2006 and the corresponding proportion for 2005 using a \(95 \%\) confidence interval. Is zero included in the interval? What does this tell you about the change in this proportion from 2005 to \(2006 ?\)
Short Answer
Step by step solution
Key Concepts
These are the key concepts you need to understand to accurately answer the question.