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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 27% from a survey taken two years before. Assume that the sample sizes are both 1451. Using a significance test, evaluate whether or not there has been a change in the percent of Internet users who download music. Provide all details for the test. (Round your value for zto two decimal places. Round your P-value to four decimal places.)
Z=
p-value=
Summarize the conclusion
Also report a 95% confidence interval for the difference in proportions. (Round your answers to four decimal places.) (_____,_____)
Explain what information is provided in the interval that is not in the significance test results.
attempting to analyze the relationship between advertising and sales the owner of a furniture store recorded the
Kristy has to make rental payments of $1,000 at the start of every month, throughout the fouryear duration of her university course. Her university fees
Students will meet the required "oral" component of the presentation by posting a PowerPoint presentation including the following criteria:
Assuming that the data may be viewed as a random sample from a normal population, construct a 99% con?dence interval for the actual variance of the air pollution index for this city and interpret.
Determine the probability 3 or more of these vehicles require warranty service.
The mean score on a 25-point placement exam in mathematics used for the past two years at a large state university is 14.3.
Past experience at the Crowder Travel Agency indicated that 44% of those persons who wanted the agency to plan a vacation for them wanted to go to Europe.
The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 370 grams and a standard deviation of 15 grams. Find the weight that corresponds to each event:
If a null hypothesis is rejected at the 0.10 significance level but not at the 0.05 significance level, then the p-value of the test is between 0.05 and 0.10.
iq data is thought to be normally distributed with a mean of 100 and a standard deviation of 15. the average iq score
You are responsible for planning the parking needed for a new 256-unit apartment complex, and you're told to base the needs on the statistic "average number of vehicles per household is 1.7."
The rest have no opinion. " Suppose that a a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?
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