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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.
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