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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.
The number of breakdowns Y per day for a certain machine is a Poisson random variable with mean λ. The daily cost of repairing these breakdowns is given by C = 3Y 2. If Y1, Y2, . . . , Yn denote the observed number of breakdowns for n independentl..
Calculate each of the following values for the data set below (assume it is a population).{3.42, 4.10, 4.15, 4.19, 4.26, 4.85, 5.01, 6.22}
Temperature is used to measure the output of a production process. When the process is in control, the mean of the process is µ = 128.5 and the standard deviation is σ = .4. Construct the x¯ chart for this process if samples of size 6 are to be us..
To prepare: Think about examples of how individuals of various ages use probability to make decisions, and decide which age group you will write about in your discussion response.
write out explicitly using bernoullis techniques the formulas for the sums of the first n fourth fifth and tenth
Does the 99% confidence interval contain the actual population mean? If not, explain why not. What proportion of many similarly constructed confidence intervals should include the true population mean value?
Apparently, some of your classmates do not understand Statistics very well because you know several of their conclusions are incorrect. Explain the mistakes in their statements below.
let x be a continuous random variable with probability density function fx given byfx ??1 6x2 3x if ?3 ? x ? 0kx?x2 if
Calculate the rate of cervical cancer for these women.- What is the estimated risk of developing cervical cancer for Vietnamese American women in the next year?
Find the probability of guessing (a) exactly three answers correctly, (b) at least three answers correctly, and (c) less than three answers correctly.
1) Waiting in Line: A Wendy's manager performed a study to determine a probability distribution for the number of people, X, waiting in line during lunch. The results were as follows (a) Verify that this is a discrete probability distribution.
condeacute nast traveler magazine conducts an annual survey of its readers in order to rate the top 80 cruise ships in
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