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Peer-to-peer music downloading. The NPD Group reported that the percent of Internet users who download music via peer-to-peer (P2P) services was 9% in late 2010, compared with 16% in late 2007.23 The filing of lawsuits by the recording industry may be a reason why this percent has decreased. Assume that the sample sizes are both 5549, the sample size reported for the 2010 survey.
Using a significance test, evaluate whether or not there has been a change in the percent of Internet users who download music via P2P services. Provide all details for the test and summarize your conclusion.
Also report a 95% confidence interval for the difference in proportions (2007 versus 2010) and explain what information is provided in the interval that is not given in the significance test results.
Construct a 95% con dence interval for the true mean. Based on the con dence interval, is the true mean likely to be 15g and find the minimum weight of the heaviest 5% of cans of soup produced.
a banks loan officer rates applicants for credit. the ratings are normally distributed with a mean of 200 and a
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Interpret the following SPSS computer output for the chi-square test. Variable COMMUTE is “How did you get to work last week?” Variable GENDER is “Are you male or female?
what is the f ratio? why is the computation of the f ratio based on mean squares instead of sums of
If the average daily intake among 25-34-year-old males in the general population is 15 g, then, using a significance level of .05, test the hypothesis that the intake of linoleic acid in this group is lower than that of the general population. Als..
An immediate adjustment will be made on any tire that does not last 50,000 miles." You purchased four of these tires. What is the probability that all four tires will last more than 50,000 miles?
What percentage of the overall sample did not smoke and had not ever been divorced?- Determine a complete set of row percentages.
shards of clay vessels were put together to reconstruct rim diameters of the original ceramic vessels found at the wind
The American Society of PeriAnesthesia Nurses (ASPAN; www.aspan.org) is a national organization serving nurses practicing in ambulatory surgery, preanesthesia, and postanesthesia care. The organization's membership is listed below.
"If you took 40 employees at random from the corporation, there is a pretty good chance the average number of days absent would be 12 or more. That's what happened to us - chance variation." Is this a good defense? Justify your answer.
Then explain your answer to someone who has never had course in statistics (but who is familiar with mean, standard deviation, and Z scores.)
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