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Cell phone ownership: 2000 versus 2004.
Refer to Exercise 8.41 (page 517). The estimated proportion of undergraduates owning a phone in 2000 was 43%. We want to test whether the proportion of undergraduate cell phone owners has more than doubled in the last 4 years.
(a) Compute the quantity pˆ 1 - 2pˆ 2 where pˆ 1 is the 2004 estimate and pˆ 2 is the 2000 estimate.
(b) Using the rules for variances, compute the standard error of this estimate.
(c) Compute the z statistic and P-value. What is your conclusion at the 5% level?
A 2005 survey of Internet users reported that 22% downloaded music onto their computers. The ?ling of lawsuits by the recording industry may be a reason why this percent has
1. A comparison of the proportion of frequent binge drinkers, revisited. Refer to Exercise 8.46. Redo the exercise in terms of the proportion of nonfrequent binge drinkers i
A matched pairs experiment compares the taste of instant versus fresh-brewed coffee. Each subject tastes two unmarked cups of coffee, one of each type, in random order and
1. Getting angry at other drivers. Refer to Exercise 8.14. The same Pew Poll found that 38% of the respondents "shouted, cursed or made gestures to other drivers" in the las
The National Survey of Student Engagement found that 87% of students report that their peers at least "sometimes" copy information from the Internet in their papers withou
Gambling is an issue of great concern to those involved in intercollegiate athletics. Because of this, the National Collegiate Athletic Association (NCAA) surveyed student-a
(a) An approximate 99% con?dence interval for an unknown proportion p is pˆ plus or minus its standard error. (b) When performing a large-sample signi?cance test for a populat
Refer to the previous exercise. The researchers in this study also measured α1-acid glycoprotein (AGP). This protein is similar to CRP in that it is an indicator of infection.
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