B1204.0o lost 19. The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call inand get answers to questions as they prepare their tax returns. In recent years, the IRShas been inundated with taxpayer calls and has redesigned its phone service as well asposted answers to frequently asked questions on its website (The Cincinnati Enquirer,January 7, 2010). According to a report by a taxpayer advocate, callers using the newzib todawell system can expect to wait on hold for an unreasonably long time of 12 minutes beforeestsmites qui being able to talk to an IRS employee. Suppose you select a sample of 50 callers afterthe new phone service has been implemented; the sample results show a mean waitingtime of 10 minutes before an IRS employee comes on the line. Based upon data from pastno board nel years, you decide it is reasonable to assume that the standard deviation of waiting timeab Iris 8 minutes. Using your sample results, can you conclude that the actual mean waitingtime turned out to be significantly less than the 12-minute claim made by the taxpayeradvocate? Use a = .05.nobslugoy

Answered: Image /qna-images/answer/5a9c547a-e7a8-450c-85fe-78d7fc6295cd.jpg

and get answers to questions as they prepare their tax returns. In recent years, the IRS has been inundated with taxpayer calls and has redesigned its phone service as well as posted answers to frequently asked questions on its website (The Cincinnati Enquirer, January 7, 2010). According to a report by a taxpayer advocate, callers using the new system can expect to wait on hold for an unreasonably long time of 12 minutes before being able to talk to an IRS employee. Suppose you select a sample of 50 callers after the new phone service has been implemented; the sample results show a mean waiting time of 10 minutes before an IRS employee comes on the line. Based upon data from past years, you decide it is reasonable to assume that the standard deviation of waiting time is 8 minutes. Using your sample results, can you conclude that the actual mean waiting ime turned out to be significantly less than the 12-minute claim made by the taxpayer dvocate? Use a = .05.

and get answers to questions as they prepare their tax returns. In recent years, the IRS has been inundated with taxpayer calls and has redesigned its phone service as well as posted answers to frequently asked questions on its website (The Cincinnati Enquirer, January 7, 2010). According to a report by a taxpayer advocate, callers using the new system can expect to wait on hold for an unreasonably long time of 12 minutes before being able to talk to an IRS employee. Suppose you select a sample of 50 callers after the new phone service has been implemented; the sample results show a mean waiting time of 10 minutes before an IRS employee comes on the line. Based upon data from past years, you decide it is reasonable to assume that the standard deviation of waiting time is 8 minutes. Using your sample results, can you conclude that the actual mean waiting ime turned out to be significantly less than the 12-minute claim made by the taxpayer dvocate? Use a = .05.

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter10: Sequences, Series, And Probability

Section10.5: The Binomial Theorem

Problem 15E

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