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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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jeyben [28]

Answer:

3√2 or 4.24

Step-by-step explanation:

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3 0
3 years ago
A science experiment calls for a mixture of 400 mL of liquid A, 2.5 L of liquid B, 650 mL of liquid C, and 1 L of liquid D. Whic
IceJOKER [234]

Answer:

5L.

Step-by-step explanation:

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5 0
3 years ago
Look at the figure shown below:
kow [346]

Answer:  b) two sides and the included angle are congruent

<u>Step-by-step explanation:</u>

  RS = QS                 SIDES are congruent

∠PSR ≡ ∠PSQ         ANGLES are congruent

 PS = PS                  SIDES are congruent

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Since we know the triangles are congruent, we can state that their parts are congruent:

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8 0
3 years ago
What is the answer???
Lapatulllka [165]
Is either I’m blind and can’t see or the letter are way too small
5 0
3 years ago
Please help me with it is a project and I put 30+ points whoever can help me with this
Debora [2.8K]

Answer:

x=1

Step-by-step explanation:

Step 1: Subtract 2x from both sides.

Step 2: Add 6 to both sides.

Step 3: Divide both sides by 6.

Answer:

x=1

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