The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in 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 posting 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 ofminutes before being able to talk to an IRS employee. Suppose you select a sample ofcallers after the new phone service has been implemented; the sample results show a mean waiting time ofminutes before an IRS employee comes on line. Based upon data from past years, you decide it is reasonable to assume that the standard deviation of waiting times isminutes. Use.

a.State the hypotheses.

:- Select your answer -greater than or equal to 15less than or equal to 15less than 15Item 1

:- Select your answer -more than 15greater than or equal to 15less than 15Item 2

b.What is the-value (to 4 decimals)?

c.Using, can you conclude that the actual mean waiting time is significantly less than the claim ofminutes made by the taxpayer advocate.