bootstrapping is a resampling technique used to generate sampling distributions for difficult statistics. which of these is not a feature of bootstrap sampling? a. (re)samples are the same size as the original sample
b. sampling is done with replacement
c. the number of (re)samples, while large, is much smaller than the possible number of samples
d. sampling is done without replacement
e. only the statistic of interest, e.g. the mean or variance, need be calculated from each sample
How do you make a sample from a sample different from the original sample?
Answers
From the given information provided, the answer to the question is d. Sampling is done without replacement.
Bootstrap sampling is a resampling technique in which samples are generated by drawing observations from the original sample with replacement. This means that each observation in the original sample has an equal chance of being selected for each bootstrap sample, and the same observation can be selected more than once. The number of bootstrap samples generated is typically large, but still much smaller than the number of possible samples that could be drawn from the population.
To make a sample from a sample different from the original sample, we can use different random seeds or generate the sample using a different method. For example, if the original sample was generated by simple random sampling, we could generate a new sample using stratified sampling or cluster sampling. Alternatively, we could generate a new sample using a different set of variables or a different time period. The goal is to create a new sample that is similar to the original sample in terms of its underlying characteristics but is not identical to it. This allows us to test the robustness of statistical methods and estimate sampling distributions without relying on assumptions about the population distribution.
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Related Questions
Hai tiếp điểm hình trụ bằng đồng có đầu hình cầu bán kính R = 70mm, lực ép tiếp điểm F = 100N, Mô đun đàn hồi của đồng là 11.8 * 106(N/cm2). Cho biết: a = 0.86 * (F*R/E)1/3, điện trở suất của đồng là 1.62 * 10-8 (Ω/m), với tiếp điểm đồng thì hệ số K1 = 3,16.10-4 (ΩN1/2). Biết các giá trị ứng suất của đồng là: σdh = 38300 N/cm2; σdẻo = 45000 N/cm2; σd.Nát = 51000 N/cm2. Tính điện trở tiếp xúc trong trường hợp thỏa mãn điều kiện tản dòng lí tưởng và trong trường hợp thực nghiệm.
Answers
Answer:
5dhydydyeze6ese6z7zuezuze6ezyezyezzeze
if d is measured in meters, then what must the units be for the proportionality constant a in order that the energy be in joules?
Answers
Answer:
[B] = kg m4/s2
Explanation:
What two types of motion are the same in which they both are under the influence of gravity?
Answers
Answer:
Orbit and Gravity
Explanation:
May I have brainliest please I would appreciate it! Have a great day!
A circuit with a battery, a 3 Ω resistor, and a 15 Ω resistor, in parallel. The total current is the system is 3.0 A. What is the voltage of the battery?
Answers
Given data:
* The current through the system is I = 3 A.
* The resistance of resistors connected in parallel is,
\(\begin{gathered} R_1=3\text{ ohm} \\ R_2=15\text{ ohm} \end{gathered}\)Solution:
The equivalent resistance of the system is,
\(\frac{1}{R_{eq}}=\frac{1}{R_1}+\frac{1}{R_2}\)Substituting the known values,
\(\begin{gathered} \frac{1}{R_{eq}}=\frac{1}{3}+\frac{1}{15} \\ \frac{1}{R_{eq}}=\frac{5+1}{15} \\ \frac{1}{R_{eq}}=\frac{6}{15} \end{gathered}\)By taking inverse value,
\(\begin{gathered} R_{eq}=\frac{15}{4} \\ R_{eq}=3.75\text{ ohm} \end{gathered}\)According to Ohm's law, the voltage across the battery is,
\(V=IR_{eq}\)Substituting the known values,
\(\begin{gathered} V=3\times3.75 \\ V=11.25\text{ volts} \end{gathered}\)Thus, the voltage across the battery is 11.25 volts.
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A car accelerates from 15 km/hr to 60 km/hr in 30 seconds what is the acceleration?
Answers
Acceleration = (change in speed)/(time)
Change in speed = (60-15) = 45 km/hr
Time for the change = 30 sec
Acceleration = 1.5 km/hr-sec
Calculate the acceleration of a truck moving along a straight path if its speed increases from
0.0 m/s to 15 m/s in 10.0 s.
Answers
Answer:
I'm not to sure but I think the answer is 1.5m/s^2
Explanation:
Acceleration = Change in Velocity over Time.
So we get 15 - 0.0 divided by 10.0 which = 1.5m/s^2
But again I'm no expert I'm learning this stuff just like you guys.
An air mass that is moving from the north pole toward the equator would be turned to the ? because of the spinning of the earth on its axis
(finish the question by putting in the correct word where the ? is)
Answers
Answer:
An air mass that is moving from the north pole toward the equator would be turned to the East because of the spinning of the earth on its axis
Explanation:
An air that is moving from the North pole toward the equator will be turned to the East (right) because of the spinning of the earth around its own axis.
What is the Coriolis effect?The Coriolis Effect can be described as an apparent effect generated by a rotating frame of reference. The effect takes place when an object moving along a straight path can be viewed from a non-fixed frame of reference.
The moving frame of reference is the one in which the Earth rotates at a fixed speed. The Coriolis effect creates wind patterns near the earth’s surface, that move to the east toward the equator and to the west toward the poles. These wind patterns are responsible for moving clouds around the globe and creating weather patterns.
Coriolis force can be described as a fictitious force resulting from the rotational movement of the earth. It only affects the wind direction and not the wind speed. The magnitude of Coriolis force can be calculated from the wind speed.
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If a gas has the same temperature throughout, which gas molecule has the highest average velocity?
Answers
Answer:
H2
Explanation:
The highest average velocity is H2.
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100 points pls answer this I need the answers quick
How is a physical property and a
Chemical property similar?
Answers
How is a physical property and a Chemical property similar?
Answer ↷⥁Physical property ⇢ The property of a substance which can be observed and compute , without altering it's chemical properties.⥁Chemical property⇢ The property of a substance which changes it into a new one when get observed.Similarities⇢Both properties describes a substance
⇢ In order to alter the chemical or physical properties, heat & energy either gets attained or lose .
A 42.0-cm-diameter wheel, consisting of a rim and six spokes, is constructed from a thin, rigid plastic material having a linear mass density of 25.0 g/cm. this wheel is released from rest at the top of a hill 69.0 m high.
Answers
For a 42.0-cm-diameter wheel, consisting of a rim and six spokes,the angular speed is mathematically given as
w=118.6 rad/s
What is the angular speed?
Generally, the equation for the Conservation of energy is mathematically given as
K1+U1=K2+U2
Therefore
Mgh+0=0+(1/2)MV2+(1/2)Iω2
Where
M=m+6m
M=2rλ(π+3)
Therefore
\(2r \lambda (\pi+3)gh=0.52r \lambda (\pi+3)(rw)2+(1/2)[(2 \pi \lambda r)r2+6( \lambda r)r2/3]w2\)
\(w=\sqrt{[(\pi+3)*9.8*53/(0.42/2)2*(\pi+2)\)
w=118.6 rad/s
In conclusion, The angular speed is
w=118.6 rad/s
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Klay Thompson and Draymond Green wanted to play a joke on Steph Curry. Kay threw a balloon horizontally at 50 m/s from 150 m high bridge. How far did the balloon go when it landed?
Answers
Klay Thompson and Draymond Green wanted to play a joke on Steph Curry. Kay threw a balloon horizontally at 50 m/s from a 150 m high bridge, then the balloon would have landed 276.5 meters away.
What are the three equations of motion?There are three equations of motion given by Newton,
v = u + at
S = ut + 1/2 × a × t²
v² - u² = 2 × a × s
By using the second equation of the motion,
S = ut + 1/2 × a × t²
150 = 0 + 0.5 × 9.8 × t²
t² = 150 / 4.9
t = 5.53 seconds
The horizontal displacement of the balloon = 50 × 5.53
= 276.5 meters
Thus, the balloon would have landed 276.5 meters away.
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Pleaseee helpppp meeeeeee I will give pountsss
Answers
Answer:
8.m= 0. 113 kg
W = 1.1074 N
g = 9.8 m/ s²
9.m= 870 kg
W = 8526 N
g = 9.8 m/s²
10.a) weight on earth:
weight = mass × acceleration due to gravity (g)
g on earth = 9.8 m/s²
W = 75 × 9.8
W = 735 N
b) g on Mars
285 = 75 × g
g = 285/ 75
g = 3.8 m/ s²
a hurricane wind blows across a 5.90 mm ×× 13.2 mm flat roof at a speed of 110 km/hrkm/hr .
Answers
The pressure difference is 562.1 Pa.
The pressure difference can be calculated using the equation:
\(ΔP = 1/2 * ρ * v^2\), where \(ρ\) is the air density and \(v\) is the wind speed.
Air density at sea level = 1.225 kg/m^3.
To convert the wind speed from km/hr to m/s, divide by 3.6.
The pressure difference can then be calculated as follows:
\(ΔP = 1/2 * 1.225 kg/m^3 * (110 km/hr / 3.6)^2\)
\(ΔP = 1/2 * 1.225 kg/m^3 * (30.56 m/s)^2\)
\(ΔP = 1/2 * 1.225 kg/m^3 * 935.24 m^2/s^2\)
\(ΔP = 562.1 Pa\)
So, the pressure difference is approximately 562.1 Pa.
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The given question is incorrect. The correct question is given as:
A hurricane wind blows across a 5.90 mm ×× 13.2 mm flat roof at a speed of 110 km/hr. What is the pressure difference?
the energy transfer that takes place by direct contact is called ____
Answers
Answer:
Conduction
Explanation:
The transfer of energy through matter by direct contact of particles is called. Conduction.
Answered by the ONE & ONLY #QUEEN herself aka #DRIPPQUEENMO!!!
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Atoms of an element can have more than 1 mass number but only one atomic number, Why?
Answers
Answer:
An element's mass number (A) is the sum of the number of protons and the number of neutrons. ... Protons and neutrons both weigh about one atomic mass unit or amu. Isotopes of the same element will have the same atomic number but different mass numbers.
Explanation:
step by step process please
I know the ans but not the process
pic attached
Answers
Answer:
\(\huge\boxed{\sf F= 350 \ N}\)
Explanation:
Considering pivot as the central point,
Key:
Torque = Force F × radius rAnticlockwise torque = Clockwise torque\(F_1r_1=F_2r_2\)
Here,
Anticlockwise force is FClockwise force is 600 N\(r_1=70+50= 120 \ cm = 1.2 \ m\)\(r_2=70 \ cm = 0.7 \ m\)Solution:Substitute the givens in the above formula.
\(F(1.2)=600(0.7)\\\\F(1.2)=420\\\\Divide \ 1.2 \ to \ both \ sides\\\\F=420/1.2\\\\F= 350 \ N\\\\\rule[225]{225}{2}\)
mastering physics Two stones are launched from the top of a tall building. One stone is thrown in a direction 30.0 ∘ above the horizontal with a speed of 18.0 m/s ; the other is thrown in a direction 30.0 ∘ below the horizontal with the same speed
Answers
Answer:
The stone thrown upward lands farther away from the building.
Explanation:
Given that,
Angle = 30° above the horizontal
Speed = 18.0 m/s
Angle = 30° below the horizontal
Suppose, Which stone lands farther away from the building ?
We need to find which stone lands farther away from the building
Using formula of range
\(R=v_{x}t\)
The horizontal velocity for the both stones is equal but the time will be different.
The time of stone thrown upward will be greater than that of downward.
Hence, The stone thrown upward lands farther away from the building.
A car moving at 5.73 m/s with a mass of 1,176 kg runs into a brick wall. If the car comesto rest over 19.9x10^-3 s during the collision, what is the force of the wall on the car?
Answers
The car starts with a velocity of 5.73 m/s. Upon colliding with the brick wall it ends with a velocity of 0 m/s. The car's exact force in the direction of the wall but the brick wall which is static also exact an equal force back. Therefore,
\(\begin{gathered} F=ma \\ F=m\frac{(5.73-0)}{19.9\times10^{-3}} \\ F=1176\times\frac{5.73}{19.9\times10^{-3}} \\ F=1176\times287.939698492 \\ F=338617.085427 \\ F=338617.09N \end{gathered}\)Need help ASAP please Thanks
Answers
Explanation: there is less light at that point.
first to answer will be marked brainliest :p
Answers
Answer:
HI!!!
Explanation:
Answer:
what is your questions
Use the information and picture to answer the following question.
A student creates a poster with two models that show magnified views of the molecular motion in a solid and a liquid.
image
The student forgets to label the models with phases.
Answering which question would BEST help identify which model is in the solid phase?
A.
Which model shows the molecules vibrating in a fixed arrangement?
B.
Which model shows the molecules bouncing around each other?
C.
Which model shows the molecules sliding past each other?
D.
Which model shows the molecules spreading out at different angles?
Answers
Answer:
The answer is A
Explanation:
Solids vibrate in a fixed arrangiment, so to find which is a solid look for the one that vibrates in a fixed arrangiment.
According to the forces of attraction, the question which would best identify model is in solid phase is which model shows the molecules vibrating in a fixed arrangement?
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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how to disintegrations per second to joules
Answers
Disintegration per second can be converted into joules using the formulae: Energy (J) = dps x Energy per decay (J/decay)
Disintegrations per second (dps) is a measure of the rate of radioactive decay, while joules is a measure of energy. The conversion between these two units depends on the specific type of radioactive decay and the energy released by each decay.
If you know the energy released by each decay, you can use the following formula to convert from dps to joules:
Energy (J) = dps x Energy per decay (J/decay)
For example, if you have a sample that is decaying at a rate of 100 dps, and each decay releases 1 MeV of energy, you can calculate the total energy released per second as follows:
Energy (J/s) = 100 dps x 1.6 x \(10^{-13}\) J/decay = 1.6 x \(10^{-11}\) J/s
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1) why were there two points on the track where the converging lenses formed a clear image, instead of one? a mathematical answer is ok for this question.
Answers
Thus, the placement of the two converging lenses has an impact on the focal length and, as a result, the location of the image.
When two converging lenses are placed near each other, two distinct points can be obtained where a clear image can be formed, rather than just one. This happens due to the fact that light rays passing through a converging lens bend inwards towards the principal axis and then meet at a specific point, which is known as the focal point. As a result of this property, the point where the light rays converge and the image is formed can vary based on the position of the object being viewed. Since the two lenses were placed near each other in the experiment, it's possible that light rays passing through the first lens were refracted inwards and then converged at a certain point, while light rays passing through the second lens were refracted inwards and converged at a slightly different point. Because of the varying positions of the two lenses, the image is formed at two distinct points instead.
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True or False? a series-parallel circuit is a combination of both series and parallel paths.
Answers
The answer to the question is True. A series-parallel circuit is a type of circuit that contains both series and parallel paths. In a series-parallel circuit, some components are connected in series while others are connected in parallel. This arrangement allows the circuit to have some of the advantages of both series and parallel circuits.
In a series-parallel circuit, the components that are connected in series are connected end-to-end, so that the current flows through each component in turn. The components that are connected in parallel are connected so that the current is split between them. This arrangement allows the circuit to have a higher overall resistance than a parallel circuit, but a lower overall resistance than a series circuit.One common example of a series-parallel circuit is a household electrical system. In this system, the main power supply is connected in parallel to the electrical panel, which is then connected in series to the various circuits throughout the house. This allows the house to have both the benefits of a parallel circuit (such as the ability to run multiple appliances at once) and the benefits of a series circuit (such as the ability to control the flow of electricity to different parts of the house).In summary, a series-parallel circuit is a combination of both series and parallel paths, and is often used in electrical systems to provide a balance of advantages between the two types of circuits.
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since the synthesizer is an electronic instrument, oscillation is not a factor in sound generation. T/F
Answers
Oscillation is a fundamental factor in sound generation for synthesizers, as they use electronic circuits to generate and control oscillations of various frequencies and waveforms to create different sounds. So, this statement is false
In a synthesizer, an electronic instrument, oscillation is an essential factor in sound generation. Oscillators in a synthesizer generate periodic waveforms, which are then processed and shaped to create various sounds. These oscillations form the basis of the electronic sound produced by the instrument.
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Suppose you decide to travel to a star 65 light-years away at a speed that tells you the distance is only 10 light-years. How many years would it take you to make the trip? _______y
Answers
It would take you approximately 1.54 years to make the trip to the star 65 light-years away at the speed that contracts the distance to 10 light-years.
What is Light years?A light-year is a unit of distance used in astronomy that measures the distance light travels in one year, which is about 5.88 trillion miles.
What is distance?Distance is a measure of the amount of space between two objects, points, or locations, usually measured in units such as miles or kilometers.
To travel to a star 65 light-years away at a speed that makes the distance seem only 10 light-years, you are experiencing a length contraction due to traveling at a significant fraction of the speed of light. To calculate the time it would take to make the trip, you can use the formula:
Time = (Contracted Distance) / (Speed)
First, find the speed at which you are traveling by dividing the actual distance by the contracted distance:
Speed = 65 light-years / 10 light-years = 6.5c (where c is the speed of light)
Now, use the formula to find the time it would take:
Time = 10 light-years / 6.5c ≈ 1.54 years
It would take you approximately 1.54 years to make the trip to the star 65 light-years away at the speed that contracts the distance to 10 light-years
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a force that pushes a small mass will have _ effect on the acceleration than that same force pushing on na large mass
A. greater
B. smaller
C. same
Answers
Answer:
a
Explanation:an example An astronaut in space has the same mass as he does on earth while having different ... Newton's Second Law of Motion: Force = mass x acceleration ... Push less to move it (use less force.) ... Gravity has an effect on an object in the vertical direction only.
Answer:
it is a greater
Explanation:
hope it helps
A pumpkin is thrown horizontally off of a building at a speed of 2.5 m/s and travels a horizontal distance of 12 m before hitting the ground.
What was the initial height of the pumpkin?
What was the final vertical velocity of the pumpkin?
Answers
Answer:
-47.04
Explanation:
Divide 12 m by 2.5 m/s which equals 4.8s
And then use 4.8s to multiply it with -9.8
4.8(-9.8)= -47.04 m/s
Hope this helped!! :)
The initial height of the pumpkin is 23.52m and the final vertical velocity of the pumpkin is 47.04 m/s.
Laws of motion:Initial horizontal speed, u = 2.5 m/s
horizontal distance covered , d = 12m
So the time taken is:
t = d/u
t = 12/2.5 s
t = 4.8s
Now, the initial vertical speed, v = 0
So the vertical distance traveled by the pumpkin will be equal to the initial height of the pumpkin:
s = vt + ¹/₂gt²
s = 0.5 × 9.8 × 4.8 m
s = 23.52m
Final vertical velocity:
v' = v + gt
v' = 9.8 × 4.8 m/s
v' = 47.04 m/s
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A 2.12kg block initially at rest is pulled to the right along a horizontal surface by a constant horizontal force of 17.7 N. The coefficient of kinetic friction is 0.109. Find the speed of the block after it has moved 4.03 m.
Answers
Answer:
Below
Explanation:
Normal force = mg = 2.12 kg * 9.81 m/s^2 = 20.8 N
Ffriction = Fnormal * coeff of friction = 20.8 * .109 = 2.27 N
NET force moving block to right = 17.7 - 2.27 = 15.5 N
Remember F= m * a
15.5 = 2.12 * a shows a = 7.3 m/s^2
d = vo t + 1/2 a t^2 vo = 0 so this is just
d = 1/2 a t^2
4.03 = 1/2 ( 7.3 ) t^2 shows t = 1.05 s
then vf = at = 7.3 ( 1.05s) = 7.7 m/s
9. Thermal energy (heat) is defined as
A. the sum of all the kinetic energies of all the particles in an object
B. the average of all the kinetic energies of all the particles in an object
C. the sum of all the numbers of particles in an object
D. the average number of particles in an object
Answers
Answer:
The correct answer is A. Thermal energy (heat) is defined as the sum of all the kinetic energies of all the particles in an object.