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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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Black bird starts his flight path from (2, 0). his flight path reaches a maximum height of 20 yards and lands at point (38, 0).
Salsk061 [2.6K]

The maximum height is 20 yards and the total horizontal distance is 36 yards, which is the distance between the point (2, 0) and (38, 0).

<h3>What is a parabola?</h3>

It is defined as the graph of a quadratic function that has something bowl-shaped.

We have:

The blackbird starts his flight path from (2, 0). His flight path reaches a maximum height of 20 yards and lands at point (38, 0).

Here the bird path will be a parabola with a maximum height of 20 yards.

The total horizontal distance traveled by the bird = The distance between the points (2, 0) and (38, 0)

= √(38-2)²

= 36 yards

Thus, the maximum height is 20 yards and the total horizontal distance is 36 yards, which is the distance between the point (2, 0) and (38, 0).

Learn more about the parabola here:

brainly.com/question/8708520

#SPJ1

8 0
2 years ago
You want to build a fence around a square garden that covers 506.25 square feet. How many feet of fence will you need to complet
Stolb23 [73]
<span>The area of a square is (length of side)^2 , the perimeter of a square is 4*(length of side) 

Then your answer is 4 * sq rt (506.25 f`t^2) = 4 * 22.5 ft = 

= 90 ft of fence</span><span>Source(s):</span>
4 0
3 years ago
Read 2 more answers
How do you round 788.44-225.6? really need help:)
Igoryamba

Answer:

532.8

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Solve each system of equations; nonlinear algebra 2<br><br> x2 + x + y - 26 = 0<br> x + y = 1
BigorU [14]

Answer:

(5,-4) and (-5,6)

Step-by-step explanation:

Given:

\left\{\begin{array}{l}x^2+x+y-26=0\\ \\x+y=1\end{array}\right.

Solve it. First, express y in terms of x from the second equation:

y=1-x

Substitute it into the first equation:

x^2+x+1-x-26=0\\ \\x^2-25=0\\ \\(x-5)(x+5)=0

Apply zero product property:

x-5=0\ \text{or}\ x+5=0

So,

x=5\ \text{or}\ x=-5

When x=5, then y=1-5=-4

When x=-5, then y=1-(-5)=6

We get two solutions: (5,-4) and (-5,6)

8 0
3 years ago
Need help ace<br><br> help pls
Alexandra [31]

Answer:

Hello I am an ace! answer: 8

Step-by-step explanation:

Volume for a cube is just length × width × height so you only need to know 1 for a cube because they will all be the same number so 8 is the answer because 8 × 8 × 8 = 512 Hope this helps!

8 0
2 years ago
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