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.