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Related Questions
It currently takes users a mean of 25 minutes to install the most popular computer program made by RodeTech, a software design company. After changes have been made to the program, the company executives want to know if the new mean is now different from 25 minutes so that they can change their advertising accordingly. A simple random sample of 51 new customers are asked to time how long it takes for them to install the software. The sample mean is 26.2 minutes with a variance of 16 minutes. Perform a hypothesis test at the 0.01 level of significance to see if the mean installation time has changed. What kind of problem is this
Answers
Testing the hypothesis in this problem which is a two-tailed test, we can conclude that there is not sufficient evidence to conclude that the mean time of installation has changed, since the p-value of the test is 0.0364 > 0.01,
At the null hypothesis, we test if the mean is of 25 minutes, that is:
[tex]H_0: \mu = 25[/tex]
At the alternative hypothesis, we test if the mean has changed, that is, if it is different than 25 minutes.
[tex]H_1: \mu \neq 25[/tex]
We have the standard deviation for the sample, thus, the t-distribution is used. The value of the test statistic is:
[tex]t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}[/tex]
In which:
X is the sample mean.[tex]\mu[/tex] is the value tested at the null hypothesis.s is the standard deviation of the sample.n is the sample size.In this problem:
25 is tested at the null hypothesis, thus [tex]\mu = 25[/tex].Sample mean of 26.2 minutes, thus [tex]X = 26.2[/tex].Sample of 51, thus [tex]n = 51[/tex].Variance of 16, thus [tex]s = \sqrt{16} = 4[/tex].The value of the test statistic is:
[tex]t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}[/tex]
[tex]t = \frac{26.2 - 25}{\frac{4}{\sqrt{51}}}[/tex]
[tex]t = 2.14[/tex]
The p-value of the test is found using a two-tailed test(test if the mean is different of a value), with t = 2.14 and 50 degrees of freedom.Using a t-distribution calculator, this p-value is of 0.0364.Since the p-value of the test is 0.0364 > 0.01, there is not sufficient evidence to conclude that the mean time of installation has changed.
A similar problem is given at https://brainly.com/question/23777908
Find the shaded region
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maybe -10.8 cuz it looks like u gotta multiply by 10 to get the full shape
What is the GCF of (4+16) using the distributive property?
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Answer:
20
Step-by-step explanation:
The GCF of 4 and 16 is 4.
[tex] \frac{4}{4} = 1 [/tex]
[tex] \frac{16}{4} = 4 [/tex]
We can rewrite this using the distribute property like so:
[tex] 4(1 + 4)[/tex]
Using the distribute property:
[tex] = 4 + 16[/tex]
[tex] = 20[/tex]
We can also add inside the parentheses and multiply we'll get the same answer.
[tex] = 4(5) \\= 20[/tex]
What is the width of a rectangular prism with a length of 24 inches and height of 10 inches and a volume of 2880 cubic inches?
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Answer:
12
Step-by-step explanation:
you reverse the operations, you multiply LxWxH to get the volume, so you can do V/L/H to get the width. 2880 divided by 24 equals 120, and 120 divided by 10 equals 12, so therefore the width is 12. Hope this helps!
What's the difference between -40ft and 3000ft
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Answer:
2960 ft.........is the difference between -40ft and 3000ft
hey can anyone help and explain this to me
Answers
hjdjenenenwnwnwmemkwksksjsj
How would you describe the plants growth? Please help!!!!
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Answer:
increasing
Step-by-step explanation:
it's increasing because throughout the days you can see that the plants growth is slowly progressing in this case going up on the grpah.
What is the difference in length between the shortest worm (3/4) and the longest worm (1 1/2) please help asap....
Answers
Answer:
3/4
Step-by-step explanation:
6/4(1 1/2) -3/4
Answer:
(1 1/2) - (3/4) = (3/4)
Step-by-step explanation:
The difference between the two worms is 3/4.
what is (x-1)-(3x+2)
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Answer:
-2x - 3
Step-by-step explanation:
1. distribute
( x - 1 ) - (3x + 2)
(x - 1) - 3x - 2
2. Eliminate redundant parentheses
(x - 1) - 3x - 2
x - 1 - 3x - 2
3. Subtract the numbers
x−1 − 3x − 2
x - 3 - 3x
4.
x − 3 − 3x
-2x - 3
Please help ! Anyone know the answer?
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Answer: a
Step-by-step explanation:
Please help. I need all of them answered. I will give extra point and brainiest to best answer.
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Answer:
See belowStep-by-step explanation:
Open the parenthesis:
#1y = (x - 7)(x + 2) = x² + 2x - 7x - 14 = x² - 5x - 14#2y = 4(x + 5)(x - 1) = 4(x² - x + 5x - 5) = 4(x² + 4x - 5) = 4x² + 16x - 20#3y = - 2(x + 1)(x - 2) = -2(x² - 2x + x - 2) = -2(x² - x - 2) = -2x² + 2x + 4Explain how you can estimate [tex]\sqrt{40[/tex]
i will give brianleist ifd you anserw
Answers
Answer:
Step-by-step explanation:
You can find the perfect squares that are closest to this by listing the perfect squares and seeing which two this square would be between, which is the square root of 36 and the square root of 49:
[tex]\sqrt{36} < \sqrt{40} < \sqrt{49}[/tex]
if i have 8 cookies and i share with 4 friends what fraction would be correct for how many cookies each person gets
A. 8/4
B.8/5
C.5/8
D.4/8
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Answer:
D.4/8
Step-by-step explanation:
Write in standard form:
one hunderd forty six million, twenty one thousand, sixty six.
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Answer:
146,021,066
Step-by-step explanation:
please give brainiest award.
What is the slope of the line shown in the graph? Express your answer as an improper fraction or as an integer
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Answer:
y= 3/2x + 1
Step-by-step explanation:
Rise over run to find slope: Rise: 3 Run:2
Y-intercept is at +1
Step-by-step explanation:
slope is the same as gradient,m
m= y2- y1
x2 - x1
(2,4) (0,1)
x2,y2 x1,y1
m= 4 - 1
2 - 0
m= 3
2
PLEASE HELP ITS MATH THANK YOUUUU
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Answer:
sorry i don't know
Step-by-step explanation:
sorry
9/3=3x1=3
Thomas Clemens lives in a town that charges a 0.5% city income tax rate. How much city income tax did he owe last year if he had federal taxable income of $45,883?
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Answer:
$2294.15
Step-by-step explanation:
45883 x .05 = 2294.15
3. Solve 1 < 3x – 2 < 13.
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Answer:
1< x <5
Step-by-step explanation:
1<3x−2<13
1+2<3x−2+2<13+2 (Add 2 to all parts)
3<3x<15
33<3x3<153 (Divide all parts by 3)
1< x <5
Answer:
(1,5)
Step-by-step explanation:
which of the following decimals has the greatest value 6.362 6.537 6.5 6.58
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Answer:
6.58 has the greatest value
6.362 < 6.5 < 6.537 < 6.58
SOMEONE PLEASE HELP!!!
3×(-9)-(-15)+2
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Answer:
-10Step-by-step explanation:
3×(-9)-(-15)+2 = -27 + 15 + 2 = -10Done
jeweler needs exactly 19,000 beads to make jewelry.
He buys 48 boxes of beads. Each box has 400 beads.
He completes the calculations below and concludes that he has bought enough boxes of beads to make all of the jewelry.
48
×
400
=
(
40
×
400
)
+
(
8
×
400
)
=
16
,
000
+
3
,
200
=
19
,
200
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Yes it’s correct
Answer:
A is the correct answer..
i got this correct on my test
cual es la raíz cuadrada de 254
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Answer: Es 15.9
Step-by-step explanation:
15.9373774505 ⬆️
Can someone help……….
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If 3x-4 = 14 then x = 6 true or false
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Answer:
True.
Step-by-step explanation:
If we put the values:
3×6-4=14
18-4=14
14=14
Hope this helps you. Have a nice day. Please mark as brainliest. It helps a lot. ^_^
(WORTH 100 POINTS)On Monday, Latrena sent an email to 5 friends. On Tuesday, each of those friends sent an email to 5 different friends. On Wednesday, each person who received an email on Tuesday sent an email to 5 different friends. How many friends received an email on Wednesday? Enter your answer as a power by filling in the boxes.
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Answer:
5 to the power of 3
Step-by-step explanation:
I took the K12 test :)
The number of friends who received an email on Wednesday can be obtained using the exponential relation between the initial number of mails and the number of days elapsed, which is 125 .
The initial number of friends who received an email = 5 friends. Number of days elapsed from Monday to Wednesday = 3 daysThe Number of people who received a mail on Wednesday can be expressed thus :
5³ = 5 × 5 × 5 = 125 friends.Therefore, 125 friends received an email on Wednesday.
Learn more : https://brainly.com/question/18796573
PLEASE ANSWER 20 POINTS
The following steps show how the equation for the average rate can be transformed so that it is written in terms of only the rates for each leg of the trip. Write an algebraic justification for each step. Think about the number operations and properties that you know.
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Answer:
Step-by-step explanation:
Step 1:
Sum of fractions in the denominator making cross product:
d / r1 + d / r2
Resulting:
d * r2 + d * r1 / (r1 * r2)
Step 2:
Multiply numerator and denominator by the following expression:
(r1 * r2) / (d * r2 + d * r1)
Step 3:
Take common factor in the denominator of the expression in step 2.
Resulting:
(d * r2 + d * r1) = d * (r2 + r1)
A tennis player hits a ball hard and 0.4 s later hears the echo sound from a wall. The speed of sound in air is 330 ms. How
?far away is the player from the wall
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The distance traveled by the echo is used to determine the player's distance from the wall
The player's distance from the wall is 66 m.
Reason:
Known parameter;
The time after which the tennis player hears the echo of the ball, t = 0.4 s
The speed of sound in air, v = 330 m/s
The distance of the player from the wall = Required
Solution:
Let d, represent the distance of the player from the wall
An echo is the reflection the wave of the sound of hitting the ball that
travels to the wall and back
The distance traveled by the sound to the wall, d, and back, (d again), is 2·d
[tex]Speed = \dfrac{Distance}{Time}[/tex]
Therefore;
[tex]The \ speed \ of \ the \ sound,\ v = \dfrac{2 \cdot d}{t}[/tex]Therefore;
[tex]330 = \dfrac{2 \cdot d}{0.4}[/tex]
330 × 0.4 = 2·d
[tex]d = \dfrac{330 \times 0.4}{2} = 66[/tex]
The distance of the player from the wall, d = 66 mLearn more here:
https://brainly.com/question/14754705
What is the sum of the 10th square number and the 2nd square number?
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Answer:
104
Step-by-step explanation:
10th square number is 100, 2nd square number is 4. 100+4=104
Nikita bought a flat for rupees 4987653. Round off the price of the flat to the nearest thousands.
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Pls help me on this.
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9514 1404 393
Answer:
domain: (-4, -2) ∪ [-1, 4]
range: (-5, 3)
Step-by-step explanation:
Domain
The domain is the horizontal extent of the graph. Here, it is comprised of two intervals. The left interval is open, as the function is not defined for x-values of -4 or -2. That interval is (-4, -2). The right interval is closed, as the function is defined for both x=-1 and x=4. That interval is [-1, 4]. The domain is the union of these two intervals.
D: (-4, -2) ∪ [-1, 4]
__
Range
The range is the vertical extent of the graph. The left portion of the graph has a range from -5 to 3, but neither of those values is included in it. That is, the range is an open interval: (-5, 3).
The right portion of the graph has a range from 1 to 2, including both of those values. This interval is already included in the interval (-5, 3), so only one interval is needed to describe the range:
R: (-5, 3)
