A survey of Internet users reported that 22% downloaded musiconto their computers. The filing of lawsuits by the recordingindustry may be a reason why this percent has decreased from theestimate of 30% from a survey taken two years before. Assume thatthe sample sizes are both 1431. Using a significance test, evaluatewhether or not there has been a change in the percent of Internetusers who download music. Provide all details for the test. (Roundyour value for z to two decimal places. Round your P-value to fourdecimal places.)
z =
P-value = 0 Correct:
Also report a 95% confidence interval for the difference inproportions. (Round your answers to four decimal places.)(_________,_________)
Explain what information is provided in the interval that is notin the significance test results.
The interval tells us there was a significant change in musicdownloads, but the test statistic is inconclusive.
The significance test does not indicate the direction of change,but the interval shows that the music downloads decreased.
The interval gives us an idea of how large the difference isbetween the first survey and the second survey.
The interval shows no significant change in music downloads. Theinterval does not provide any more information than thesignificance test would tell us.
