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 newsystem can expect to wait on hold for an unreasonably long time of 12 minutes beforebeing 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 pastyears, you decide it is reasonable to assume that the standard deviation of waiting timeis 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.
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
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
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
time turned out to be significantly less than the 12-minute claim made by the taxpayer
advocate? use a = .05.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 1 images
