# STATISTIC

A survey of Internet users reported that 21% downloaded music onto their computers. The filing of lawsuits by the recording industry may be a reason why this percent has decreased from the estimate of 31% from a survey taken two years before. Suppose we are not exactly sure about the sizes of the samples. Perform the calculations for the significance tests and 95% confidence intervals under each of the following assumptions. (Use previous − recent. Round your test statistics to two decimal places and your confidence intervals to four decimal places.)

(i) Both sample sizes are 1000.
z = ____________

(ii) Both sample sizes are 1600.
z = _____________

(iii) The sample size for the survey reporting 31% is 1000 and the sample size for the survey reporting 21% is 1600.

z = _____________

## Similar Questions

1. ### STATISTIC

A survey of Internet users reported that 20% downloaded music onto their computers. The filing of lawsuits by the recording industry may be a reason why this percent has decreased from the estimate of 28% from a survey taken two
2. ### statistics

Webcredible, a UK-based consulting firm specializ- ing in websites, intranets, mobile devices, and applications, conducted a survey of 1,132 mobile phone users between February and April 2009. The survey found that 52% of mo- bile

Webcredible, a UK-based consulting firm specializ- ing in websites, intranets, mobile devices, and applications, conducted a survey of 1,132 mobile phone users between February and April 2009. The survey found that 52% of mo- bile
4. ### Statistics

According to the Pew Internet &American Life Project. 75% of American adults use the internet. The Pew project authors also peported on the percentage of Americans who use the internet by age group. The data in the in the agefile
5. ### Math

if brazil got 11401 internet subscribers (1000s) and 67510 internet users (1000s)and world got 518600 internet subscribers and 1544854 internet users what is the formula to find internet users per subscriber (average) and internet
6. ### Math (Statistics: Test Statistic, Proportion)

The Pew Research Center Internet Project, conducted on the 25th anniversary of the Internet, involved a survey of 857 Internet users (Pew Research Center website, April 1, 2014). It provided a variety of statistics on Internet
7. ### Educational Technology

1. Why is it illegal to download music from many P2P networks? A.P2P networks are illegal B.The artist usually has not given perimiission for this download•• C.You may spread computer viruses D.Spyware will be put on your