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wlad13 [49]
3 years ago
14

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.†Source: 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 time turned out to be significantly less than the 12-minute claim made by the taxpayer advocate? Use α = 0.05
Mathematics
2 answers:
antoniya [11.8K]3 years ago
8 0

Answer:

Given confidence level=0.05

Hence the significance level=1-0.05=99.5

As standard deviation is 8 min,

Based on above results,we conclude that actual means is significantly less than 12 minute.

kozerog [31]3 years ago
5 0

Answer:

Step-by-step explanation:

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Andrew has already played 32 minutes on his video game this morning and wants to play an additional 15 minutes on each of x game
belka [17]

Given :

Andrew has already played 32 minutes on his video game this morning and wants to play an additional 15 minutes on each of x games after school today.

To Find :

Which equation can be used to find y, the total minutes Andrew will play video games today.

Solution :

Number of minutes he play after school time, n = 15x .

Number of minutes already played, c = 32 .

So, total number of minutes he play games for today is :

y = n + c

y = 15x + 32

Therefore, equation which is useful to find number of minutes video game played per day is y = 15x + 32 .

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3 years ago
What is the volume of the following rectangular prism?
sergij07 [2.7K]

Answer:

33 cubic unit

Step-by-step explanation:

Volume of the prism = base area * height

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3 years ago
will the opposite of a number always,sometimes,or never be greater than the number itself??????? can someone do an example and a
weeeeeb [17]

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-8 ==> 8 . . . . . . greater
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We've seen that the opposite can be less, and it can also be greater.
I guess that means that it's sometimes greater.

8 0
3 years ago
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