A random sample of 35 used car lots found that the average price of a used car is $11,750. Assume the population standard deviation is $1,225. Using a 90% confidence level, calculate the following:
Critical Value
Group of answer choices A.1.645 B. 1.96 C . 2.05 D. 1.28
* please show me how you worked it out. Thanks!
Answers
The critical value for a 90% confidence level with a sample size of 35 is A) 1.645.
To calculate the critical value, we need to use the formula:
Critical value = (Z-score at the desired confidence level) x (population standard deviation / square root of sample size)
Where Z-score at 90% confidence level is 1.645 (we can find this value using a Z-score table or a calculator).
The population standard deviation is given as $1,225 and the sample size is 35. Thus,
Critical value = 1.645 x ($1,225 / sqrt(35)) = 328.15 / 5.916 = 1.645 (rounded to three decimal places).
Therefore, the critical value for a 90% confidence level with a sample size of 35 is 1.645. This means that we can be 90% confident that the true population mean falls within a range of ±1.645 standard errors from the sample mean.
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Related Questions
Brad loves his new motorcycle. He takes it for a spin and travels 70 km in 1.2 h. He then stops to let
everyone admire it for 0.30 h. Finally he zooms off down the highway and travels 100 km. in next 1.0 h.
Calculate motorcycle’s average speed.
Answers
Answer:
113.33333333 km/hr
Explanation:
The formula for Average Speed = Distance (Kilometers)/Time(hours)
Total Distance travelled = 70km +100km
= 170km
The Total time is takes to travel that distance = 1.2h + 0.30h + 1h
= 1.50hr
Average speed of the Motorcycle = 170km/1.5hr
= 113.33333333 km/hr
is it possible to make your lifetime displacement zero, if so where would you go?
Answers
Answer:
Yes
Explanation:
Displacement is the distance from the starting point to the end point. If you live and die at the same place, you will have 0m as your displacement.
calculate the force applied to raise a table to a height of 8m if 120j of work was done
Answers
The force applied to raise a table to a height of 8m when 120 Joules of work is done is 15 N. That is, Force F = 15N
What is Work ?Work is the product of force and distance in the direction of force. Work is done on an object when the displacement of the object is in the direction of the force applied. That is,
W = F x S
The S.I unit of work is Joule.
Given that a table to a height of 8m and 120J of work was done. To find the force applies, the parameters to consider are
Work W = 120 JDistance S = 8 mForce F = ?Make force F the subject of formula from the formula written above. That is,
F = W/S
F = 120 / 8
F = 15 N
Therefore, if the 120 Joule of work is done, the force applied to raise a table to a height of 8m is 15 Newtons.
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A biker with a mass of 75.0 kg moves along the path with a constant velocity of 5.00m/s. What is the bikers momentum?
Answers
Given the mass of the biker is m = 75.0 kg.
The constant velocity is v = 5.00 m/s.
The momentum of the biker is calculated by the formula.
\(p=mv\)Put the given values,
\(\begin{gathered} p=(75.0kg)\times(5.00\text{ m/s)} \\ p=375kg\text{ m/s} \end{gathered}\)Thus, the biker's momentum is p = 375 kg m/s.
Justin and Kenneth have been best friends for as long as they can remember. Kenneth loves to run, but Justin hates to exercise. Recently, they both went for an annual checkup at the doctor, and they are comparing their blood test results. Based on the information you know, which of the following is most likely true?
Answers
Answer: Justin will have higher level of hemoglobin.
Explanation: athletes have an increased total mass of red blood cells and hemoglobin in circulation.
Answer:
Justin will have higher level of hemoglobin.
Explanation:
Use the drop-down menus to choose the phrase that best describes the way each disease can be inherited.
diabetes:
sickle-cell anemia:
color blindness:
Answers
Answer:
1.through multiple .
2.through recessive .
3.through linked
Explanation:
Answer: Diabetes: multiple
SCA: recessive
color blind: s!x linked
Explanation:
<3
what is the density of alcohol?
Answers
Answer:
789 kg/m³
Explanation:
Explanation:
The density of alcohol is 800 Kg/m^3 .
What is the gravitational force that two objects would feel if they are 3.5 meters apart? Object 1 has a mass of 10x10^5 kg and object 2 has a mass of 3x10^5 kg?
Answers
Answer:
1.63 N
Explanation:
F = GMm/r^2
= (6.67x10^-11)(10x10^5)(3x10^5) / 3.5^2
= 1.63 N ( 3 sig. fig.)
A horizontal force of 0.9N act on a body of mass 0.1kg there is resistance of 0.15 Newton opposing the first Force what acceleration will be produced please help
Answers
Answer:
a = 7.5 [m/s²]
Explanation:
To solve this type of problem we must remember Newton's second law, which tells us that the sum of forces on a body is equal to the product of mass by acceleration.
∑F = m*a
where:
∑F = sum of forces [N]
m = mass = 0.1 [kg]
a = acceleration [m/s²]
Now replacing:
\(0.9-0.15=0.1*a\\a=7.5 [m/s^{2} ]\)
by rounding to the nearest integer digit, state how the centerline of a jet decays and the half angle spread rate of a jet. all jets flowing into the same fluid as the jet have this same spread rate and decay. this behavior is called self-preserving or self-similar and is shown by the plot made in task 10. 2) assuming the pressure transducer has an uncertainty of 0.05 inches of water, what is the lowest velocity you can measure with a pitot tube before the measured velocity is less than the velocity corresponding to the uncertainty in the dynamic pressure measurement? assume the measures are being made in our room temperature and pressure air.
Answers
The centerline of a jet decays exponentially with a decay rate of approximately -0.59 and a half angle spread rate of approximately 0.11.
What is velocity?Velocity is a vector quantity that measure the rate and direction of the change. Velocity is an object position it is equal to distance traveled devide by time.
This self-preserving behavior is due to the conservation of momentum of the jet, which causes the jet to spread out from the centerline as it travels downstream.
The lowest velocity that can be measured with a pitot tube before the measured velocity is less than the velocity corresponding to the uncertainty in the dynamic pressure measurement is approximately 4.2 m/s (9.4 mph). This is calculated by solving for the velocity at a dynamic pressure of 0.05 inches of water, which at our room temperature and pressure is equal to 4.2 m/s.
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The centerline of a jet decays exponentially with a decay rate of approximately -0.59 and a half angle spread rate of approximately 0.11.
What is velocity?Velocity is a vector quantity that measure the rate and direction of the change. Velocity is an object position it is equal to distance traveled divide by time.
This self-preserving behavior is due to the conservation of momentum of the jet, which causes the jet to spread out from the centerline as it travels downstream.
The lowest velocity that can be measured with a pitot tube before the measured velocity is less than the velocity corresponding to the uncertainty in the dynamic pressure measurement is approximately 4.2 m/s (9.4 mph). This is calculated by solving for the velocity at a dynamic pressure of 0.05 inches of water, which at our room temperature and pressure is equal to 4.2 m/s.
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a cyclist covers a distance of 750m in 2 min 30sec what is the speed in km/hr of the cyclist?
Answers
Answer:
hey mate your answer is here
A wax block floats in water and an iron block sink in water, compare the densities of wax, water and iron. A. Pwater > Piron > Pwax B. Piron > Pwater > Pwater > Pwax C. Pwax > Pwater > Piron
Answers
B. Piron > Pwater > Pwax
Wax normally floats in water,it is less dense than water.
Iron is more dense than water, so it sinks.
Answer:
B. P iron > P water > P wax
Wolfgang pauli hypothesized an exclusion principle. This principle says two electrons in an atom cannot have the same what?.
Answers
No two electrons in an atom or molecule may have the same four electronic quantum numbers, according to the Pauli Exclusion Principle. Only two electrons can fit into an orbital at a time, hence they must have opposing spins.
What is Pauli's exclusion principle ?According to Pauli's exclusion principle, two electrons cannot share the same orbital and must have anti-parallel or opposite spins. Example: Two bonded electrons in a neutral helium atom achieve the opposite spin to occupy the lowest-energy () states.
It is known as the exclusion principle because, in accordance with it, all other electrons in an atom are excluded from having the same set of specific values for the four quantum numbers as one electron in the atom.Learn more about Pauli's exclusion principle here:
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A negative charge feels a force when stationary in an electric field. moving parallel to an electric field. moving parallel to a magnetic field. moving perpendicular to a magnetic field. stationary in a magnetic field. moving perpendicular to an electric field.
Answers
Answer:
stationary in an electric field.
moving perpendicular to a magnetic field.
moving perpendicular to an electric field.
Explanation:
Negative charge: In physics, the term "negative charge" is defined as a phenomenon that consists of a surplus or different electrons in any field i.e magnetic or electric field.
However, the correct answer in the question above, would be:
"stationary in an electric field".
"moving perpendicular to a magnetic field".
"moving perpendicular to an electric field".
A man is pushing a heavy crate up an inclined plane into the back of semi trailer.What can the man do to make it easier to get the crate up the ramp
Answers
Answer:
B) Make the ramp longer
Explanation:
A machine is a device that makes work more easier and faster. A machine also saves time.
A ramp is a simple machine that is used to lift heavy object with a force that is lesser than the actually force needed. A ramp is in the shape of an inclined plane, which makes pushing an object easier than the required force needed.
The formula for a ramp is given by:
Force needed to push * length of the ramp = weight of object * height of ramp.
Force needed to push = (weight of object * height of ramp) / length of ramp
We can see that the force needed is inversely proportional to the ramp length. Hence for a ramp with longer length you need lesser force to raise the object.
PLZ HELP EASY
DEFINE magnitude.
Answers
Answer:
the great size or extent of something
Explanation:
Answer:
The absolute size,extent or importance of something.
What is the IMA of the following pulley system?
Answers
And IMA stands for Ideal Mechanical advantage
Answer:
5
Explanation:
PLEASE HELP!!!!!!!!!!!!!!!!
Select all the mistakes.
Suppose that we are given a vector with magnitude M and angle g. To resolve a vector into its horizontal and vertical components, we first diagram the vector as the hypotenuse of an isosceles triangle. The angle given is put at the bottom left corner of the triangle. We calculate the vertical component as M sin g. We calculate the horizontal component as M arcsin g. We have to be careful with the trigonometric functions and be sure that our values are for degrees or radians according to how the angle g is given.
Answers
Answer:
Errors:
1) Hypotenuse pertains to right triangles - if the triangle were isosceles then the acute angles would each be necessarily 45 degrees.
2) the horizontal component is M cos g
How deep is the floor of the ocean if a sonar sound takes 7 seconds to return back to the ship?
Answers
Are nickels ferromagnetic
Answers
Answer:
yes they are. they are one of only 4 metals that are ferromagnetic.
Two batons have equal mass and length. Which will be ""easier"" to spin about the center?.
Answers
Two batons have equal mass and length than both will be ""easier"" to spin about the center.
What is moment of body?The amount of a force and its separation from the rotational axis determine its moment. The force's strength is expressed as the moment of a force around a point (the perpendicular distance of the line of action of the force from the point).
Given in the question two batons have equal mass and length that means that moment of batons will be same because both have same configuration.
If the mass and length of two batons are same, it will be "easier" for both to spin around the center.
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calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60km/h
Answers
The work done to stop the car is -208.33 kJ
From work-kinetic energy principles, the change in kinetic energy of the car ,ΔK equals the work done to stop the car, W.
W = ΔK = 1/2m(v'² - v²) where
m = mass of car = 1500 kg, v = initial velocity of car = 60 km/h = 60 × 1000 m/3600 s = 16.67 m/s and v' = final velocity of car = 0 m/s (since the car stops).Calculating the work doneSubstituting the values of the variables into the equation, we have
W = 1/2m(v'² - v²)
W = 1/2 × 1500 kg(v(0 m/s)² - (16.67 m/s)²)
W = 750 kg(0 (m/s)² - 277.78 (m/s)²)
W = 750 kg(- 277.78 (m/s)²)
W = -208333.33 J
W = -208.33333 kJ
W ≅ -208.33 kJ
So, the work done to stop the car is -208.33 kJ
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A repulsive force of 400 N exists between an unknown charge and a charge of +4. 7 μC.
If they are separated by 3 cm, what is the magnitude of the unknown charge?
Answers
The magnitude of the unknown charge is 1.046 * 10^{-6} C.
Coulomb's law formula is used to solve this type of problem. Here, repulsive force, magnitude and Coulomb's law are used. The repulsive force is a force between two charged objects with the same charge. It causes objects to repel each other. Magnitude refers to the size or strength of something. Coulomb's law is used to measure electric force between charged objects. The formula is F =\frac{ k(q1q2)}{d^2}. Here, F is the repulsive force, q1 and q2 are the magnitude of charges, d is the distance between the charges and k is Coulomb's constant. The repulsive force between two charges of +4.7 µC and an unknown charge is 400 N. They are separated by 3 cm. We can use Coulomb's law to find the magnitude of the unknown charge
F =\frac{ k(q1q2)}{d^2}
400 N = \frac{(9 * 10^{9})(4.7* 10^{-6})q}{d^2d }= 0.03 m (3 cm = 0.03 m)
Substitute the given values and solve for the unknown charge:
400 N = \frac{(9 * 10^{9})(4.7 * 10^{-6})q}{(0.03)^2q} =1.046 * 10^{-6} C
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Basketball was originally created to keep what athletes in shape during the off season?
Your answer:
Soccer players
Baseball players
Track runners
Basketball players
Answers
Answer:
Basketball players
Explanation:
Basketball players
An old woman is worried about time. She walks at a rate of 2 meters per second and travels a
distance of 454 meters. How long does it take her to complete the motion?
Please help ASAP!! BRAINLIST please explain thankyou!!!
Answers
Answer:
227 seconds.
Explanation:
Speed is equal to distance divided by time. s = d/t
We can rearrange this algebraically to solve for the time it will take to cover a certain distance at a certain speed. Time is equal to distance divided by speed. t = d/s
Then we substiture our known values for the variables and solve for our unknown.
t = 454m / 2m/s = 227s
Answer:
If the lady is traveling 2 meters per second and she travels 454 meters then you will have to divide 454 by 2 to get the amount of time she walked.
454 divided by 2 = 227
This means that the lady traveled for 227 seconds or about 3.78 minutes.
Hallar la distancia que recorre una movil al cabo
de 8s si posee una velocidad de 5m/s y acelera a razón de 3 m/s
Answers
Answer:
Distancia, S = 136 metros
Explanation:
Dados los siguientes datos;
Aceleración, a = 3 m/s²
Velocidad inicial, u = 5 m/s
Tiempo, t = 8 segundos
Para encontrar la distancia recorrida, usaríamos la segunda ecuación de movimiento;
S = ut + ½at² Sustituyendo en la fórmula, tenemos;
S = 5 × 8 + ½ × 3 × 8²
S = 40 + 1,5 × 64
S = 40 + 96
Distancia, S = 136 metros
Un neumático sin cámara, soporta una presión de 1.5 atm cuando la temperatura ambiente es de 300°K. ¿Qué presión llegará a soportar dicho neumático si, en el transcurso de un viaje, las ruedas alcanzan una temperatura de 67ºC? Atm
Answers
Answer:
El neumático soportará una presión de 1.7 atm.
Explanation:
Podemos encontrar la presión final del neumático usando la ecuación del gas ideal:
\( PV = nRT \)
En donde:
P: es la presión
V: es el volumen
n: es el número de moles del gas
R: es la constante de gases ideales
T: es la temperatura
Cuando el neumático soporta la presión inicial tenemos:
P₁ = 1.5 atm
T₁ = 300 K
\( V_{1} = \frac{nRT_{1}}{P_{1}} \) (1)
La presión cuando T = 67 °C es:
\( P_{2} = \frac{nRT_{2}}{V_{2}} \) (2)
Dado que V₁ = V₂ (el volumen del neumático no cambia), al introducir la ecuación (1) en la ecuación (2) podemos encontrar la presión final:
\( P_{2} = \frac{nRT_{2}}{V_{2}} = \frac{nRT_{2}}{\frac{nRT_{1}}{P_{1}}} = \frac{P_{1}T_{2}}{T_{1}} = \frac{1.5 atm*(67 + 273)K}{300 K} = 1.7 atm \)
Por lo tanto, si en el transcurso de un viaje las ruedas alcanzan una temperatura de 67 ºC, el neumático soportará una presión de 1.7 atm.
Espero que te sea de utilidad!
a heavy spherical ball is dropped into the can, and then liquid is poured into the can until the ball is just covered. recall that the volume of a cylider is
Answers
This means that the can can hold up to 785.4 cubic centimeters of liquid when filled to the brim.
Based on the information provided, it sounds like we're dealing with a cylinder-shaped container (the can) that has a heavy spherical ball dropped into it. Then, liquid is poured into the can until the ball is just covered.
To calculate the volume of the cylinder (which we'll need to know in order to figure out how much liquid was poured in), we'll need to know the height and radius of the cylinder. Once we have those values, we can use the formula for the volume of a cylinder, which is:
V = πr^2h
where V is the volume, π (pi) is a constant equal to approximately 3.14, r is the radius, and h is the height.
So, if we know that the cylinder is, say, 10 cm tall and has a radius of 5 cm, we can plug those values into the formula to get:
V = π(5^2)(10)
V = 785.4 cubic centimeters (rounded to one decimal place)
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What type of radiation can be stopped by a approximately 5 cm of air.
Answers
Have a good day :)
which device conferts electric energy into mechanical energy
Answers
An electric motor converts electrical energy into mechanical energy.
What is electric motor?
An electric motor is an electrical machine that converts electrical energy into mechanical energy.
A generator is mechanically identical to an electric motor, but operates with a reversed flow of power
Hence it will convert mechanical energy into electrical energy.
Some applications of electric motor are:
Industrial fans, blowers and pumps, machine tools, household appliances, power tools, vehicles, and disk drives.
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