yall help me pwease im so bad at math

The statement ' if this model suffers from heteroskedasticity, then the usual OLS t statistics no longer have a t distribution and the f statistics no longer have an f distribution' is true because a model suffering from heteroskedasticity will not be accurate.

If a model suffers from heteroskedasticity, which is the condition where the variance of the errors is not constant across observations, then the usual OLS t statistics and F statistics no longer have t or F distributions, respectively. In other words, the standard errors of the coefficients and the overall fit of the model cannot be accurately estimated using the usual assumptions of OLS regression.

Specifically, when heteroskedasticity exists, the OLS estimator remains unbiased, consistent, and asymptotically normal, but its estimated standard errors are biased and inconsistent, leading to invalid inference. This means that t-tests for individual coefficients and F-tests for overall model significance based on these standard errors may be unreliable.

Instead, alternative methods such as robust standard errors or weighted least squares should be used to correct for heteroskedasticity.

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Answer: #4 is b

Step-by-step explanation:

The eigenvalues of a are 2, 2, 5, then a is invertible matrix .

The eigenvalues are 2, 2, 5.

(A) First check the matrix is certainly invertible.

The matrix is invertible when the product of eigenvalues does not equal to zero.

invertible of A = 2*2*5

invertible of A = 20 ≠ zero.

So the matrix is certainly invertible.

(B) Now we check the matrix is certainly diagonalizable.

We note that the eigen value 2 has an algebraic multiplicity of 2 (number of repetitions), but we are unsure if the accompanying eigen vectors likewise have a count of two (geometric multiplicity)

The sum of the algebraic multiplicities must equal the sum of the geometric multiplicities in order for A to be diagonalizable.

In this instance, there is no evidence to support the geometric multiplicity of the eigenvalue 2. Therefore, we are unable to affirm that A is diagonalizable

So A can not be diagonalizable.

(C) Now we check the matrix is certainly not diagonalizable.

If the homogeneous equation from (A-⋋I)x=0 when the eigen value ⋋=2 is substituted x+y+z=0, then the solution set is x=-k-m where y=k, z=m are the parameters.

So it can be written as

\(\left[\begin{array}{ccc}x\\y\\z\end{array}\right] = k\left[\begin{array}{ccc}-1\\1\\0\end{array}\right] + m \left[\begin{array}{ccc}-1\\0\\1\end{array}\right]\)

Putting k=1 and m=1, then the corresponding eigen vectors for ⋋=2 are  

\(\left[\begin{array}{ccc}-1\\1\\0\end{array}\right] , \left[\begin{array}{ccc}-1\\0\\1\end{array}\right]\)

So the geometric multiplicity of the eigen value ⋋=2 is 2.

The algebraic multiplicity = Geometric multiplicity we can see the given matrix A is diagonalizable.

So the statement is false.

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Answer:

\(D. 7x^{2}(\sqrt[3]{x^{2}y} )\)

Step-by-step explanation:

is this edge?

If it is, my friend had the same question i think. I didn't tho

Fractional part of battery: B

t: hours

After 50 hours of use:

Substitute the t in the equation by 50 and evaluate:

• The figure is a triangular prism

• The surface area is 88.54 sq mm

The given figure is a triangular prism.

The surface area is given as follows:

Answer: 11, 45, 45, 54, 520

Answer:

11,45,54,520

Step-by-step explanation:

Answer:

Your answer would be the letter a

Answer:

Step-by-step explanation:

180 -133 = 47

180-142=38

38+47= 85

180 - 85 = 95

180 - 95= 85

The answer is A

1. The Lewis dot structure is a representation of the valence electrons in an atom or molecule using dots. It helps us understand how atoms bond together to form compounds. The Lewis dot structure can be used for a variety of compounds, including ionic compounds, covalent compounds, and polar covalent compounds. Therefore, options a, b, c, d, and e are all valid inclusions for the Lewis dot structure.

2. In a dot structure with more than two atoms, a carbon atom can form multiple bonds. The number of bonds a carbon atom must have depends on the number of valence electrons it needs to complete its octet. Carbon has four valence electrons, so it can form up to four covalent bonds with other atoms to complete its octet.

3. In an oxoacid, acidic hydrogen atoms are connected to oxygen atoms. Oxoacids are acids that contain oxygen, hydrogen, and another element. The acidic hydrogen atoms are bonded to the oxygen atoms and can dissociate to release hydrogen ions (H+) in water.

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Unit rate is the quantity of an amount of something at a rate of one of another quantity.

The fewest number of hours he would need to work to reach his goal of $280 is 28 hours working in the library.

It is the quantity of an amount of something at a rate of one of another quantity.

In 2 hours, a man can walk for 6 miles

In 1 hour, a man will walk for 3 miles.

We have,

Amount to earn = $280

Grocery store:

Earnings per hour = $8

1 hour = $8

Multiply 280/8 on both sides.

280/8 x 1 hour = $280

35 hours = $280

Library:

Earnings per hour = $10

1 hour = $10

Multiply 280/10 on both sides.

28 hours = $280

We see that,

Working in the Library would make $280 in fewer hours than working in the grocery store.

Thus,

The fewest number of hours he would need to work to reach his goal of $280 is 28 hours working in the library.

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Answer:

170.25

Step-by-step explanation:

15% x 1135

15/100 x 1135

170.25

Hello :D

10% of 1135 = 1135/10 = 113.5

5% of 1135 = 113.5/2 = 56.75

15% of 1135 = 113.5 + 56.75 = 170.25

Answer  = 170.25

The value of E(XY) is equivalent or equal to -1 according to the joint pdf having function f(x, y) = xe^−x(1 + y) x ≥ 0 and y ≥ 0 0.

Given that:

f(x,y) = xe^-x(1+y), where x ≥ 0 and y ≥ 0 0.

E(XY) = ∫∞ ∫∞ xy. xe^−x(1 + y) dx dy

            0   0

E(XY) = ∫∞ ∫∞ x^2y . e^−x(1 + y) dx dy

            0   0

E(XY) = ∫∞ x^2 . e^−x (∫∞ y e^-xy dy) dx

             0                     0

E(XY) = ∫∞ x^2 . e^−x (-1/x) dx

             0

E(XY) = - ∫∞ x . e^−x dx

               0

E(XY) = - 1

Two components of a minicomputer have the following joint pdf for their useful lifetimes X and Y are equal to i.e. E(XY) = -1.

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The system of inequalities that describes this scenario is presented as follows:

One possible solution is given as follows:

(2,15).

Meaning that she has 2 dimes and 15 nickels.

The variables for the system of inequalities are given as follows:

The amounts cannot be negative, hence:

She has at least 15 coins, hence the first constraint is given as follows:

x + y ≥ 15.

A dime is worth $0.1, while a nickel is worth $0.05. The coins are worth a maximum of $1, hence:

0.1x + 0.05y ≤ 1.

The solution set of the inequality is composed by the shaded region on the graph given at the end of the answer.

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Based on the mean and standard deviation of men's heights at that time, the tallest living man had a more extreme height compared to the shortest living man.

The question asks which of the two men, the tallest living man or the shortest living man at that time, had a height that was more extreme.

To determine this, we need to compare their heights to the mean and standard deviation of men's heights at that time.

The mean height of men at that time was 177.71 cm, and the standard deviation was 6.03 cm.

The tallest living man had a height of 237 cm, which is 59.29 cm above the mean (237 - 177.71 = 59.29).

The shortest living man had a height of 139.5 cm, which is 38.21 cm below the mean (177.71 - 139.5 = 38.21).

To determine which height is more extreme, we can compare the distance from each height to the mean.

The distance from the tallest man's height to the mean is 59.29 cm, while the distance from the shortest man's height to the mean is 38.21 cm.

Since the distance from the tallest man's height to the mean is greater than the distance from the shortest man's height to the mean,  we can conclude that the tallest living man had the height that was more extreme.

In summary, based on the mean and standard deviation of men's heights at that time, the tallest living man had a more extreme height compared to the shortest living man.

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The the value of the length AC =10.7 cm.

ABCD is a kite,  AC⊥DB and DE=EB

From the given triangle AED, length of BD is 10 cm , so lengh of DE will be 5 cm.

The three sides of a right triangle are connected by the geometry theorem known as the Pythagorean theorem. According to this rule, the square on the hypotenuse of a right triangle is equal to the sum of the squares on the other two sides.

Now, using the pythagoras theorem and solving further for the ΔAED, we get,

AD^2=AE^2+DE^2

6^2=AE^2+5^2

36=AE^2+25

AE=3.3

Similarily, using the pythagoras theorem and solving further for the ΔCED

CD^2=CE^2+DE^2

9^2=CE^2+5^2

CE^2=81-25

CE=7.4cm

As from the figure,AC=AE+EC , so we can write as follows,

AC=3.3+7.4

AC=10.7cm

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In the short run, an automobile maker experiencing an increase in the demand for a certain kind of car will be limited in its ability to adjust its production capacity.

In economics, the short run refers to a period of time during which some factors of production are fixed, while others can be adjusted. In the context of the automobile maker facing increased demand for a specific car, the short run implies that certain aspects of production capacity cannot be changed immediately.

In the short run, the automobile maker may not have the flexibility to expand its production facilities or build new manufacturing plants. This means that the company is constrained by its existing resources and production capacity. Instead, the company can make temporary adjustments to production levels by utilizing existing resources more efficiently, such as adding additional shifts or optimizing the utilization of labor and machinery.

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The curve of intersection between the cylinder x^2 + y^2 = 1 and the plane y + z = 2 is a circle lying on the plane y + z = 2. The parametric equations for this curve are x = cos(θ), y = sin(θ), and z = 2 - sin(θ), where θ is the parameter representing points on the circle.

To find the parametric equations for the curve of intersection between the cylinder and the plane, we can start by parameterizing the cylinder using the angle θ. Since the equation x^2 + y^2 = 1 represents a circle in the x-y plane with radius 1, we can use θ as a parameter to represent points on this circle.

The parametric equations for the cylinder are:

x = cos(θ)

y = sin(θ)

z = 2 - y

Next, we substitute these equations into the plane equation y + z = 2 to determine the intersection points. By substituting y and z, we have sin(θ) + 2 - sin(θ) = 2, which simplifies to sin(θ) - sin(θ) = 0. This implies that the plane equation is satisfied for any value of θ.

Therefore, the intersection between the cylinder and the plane is the entire cylinder itself, lying on the plane y + z = 2. The parametric equations for the curve of intersection are x = cos(θ), y = sin(θ), and z = 2 - sin(θ).

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Answer:

x=12

Step-by-step explanation:

AB/FE=BC/EC

x/6= 5+5/5

x/6=10/5

x=6(2)

x=12

~

The percentage increase in the price of petrol when increased from 12,58 per litre to 13,28 per litre is 5.56%

The change in the price of the petrol is given as

Increased from 12,58 per litre to 13,28 per litre.

This means that the change in the price is

Change = 13.28 - 12.58

Evaluate the difference

Change = 0.7

The percentage increase in the price of petrol is then calculated as

Percentage = 0.7/12.58 * 100%

Evaluate the prodcuts

Percentage = 5.56%

Hence, the change is 5.56%

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Step-by-step explanation:

hope you have understood.

Answer:

4 tickets

Step-by-step explanation:

3.25 x 4 = 13

She can afford 4 tickets and have 1.75 $ left over.

hopefully this helps you :)

pls mark brainlest ;)

All parallelograms are quadrilaterals, so if it is a parallelogram, it is also a quadrilateral. The correct answer is that all trapezoids are quadrilaterals.

Answer:

Step-by-step explanation:

17

Three options for the given area of a rectangular room is 750 square feet and the relation between width and length is equal to :

b. y² -5y =750

c. 750 – y(y – 5) = 0

e. (y + 25)(y – 30) = 0

As given in the question,

Given area of a rectangular room  =  750 square feet

Let y be the length of the rectangular room ,

Then width of the rectangular room = y -5

Area of rectangular room = length × width

⇒ 750 = y (y -5)

Option which are same as the required equation are :

a.  y(y + 5) = 750

Here y +5 is used .Not a valid option

b. y² -5y =750

⇒y(y-5) =750

Valid option.

c. 750 – y(y – 5) = 0

⇒y(y-5) =750

Valid option.

d. y(y – 5) + 750 = 0

⇒ y(y-5) =-750

Not valid option

e. (y + 25)(y – 30) = 0

⇒y² -30y +25y-750 =0

⇒y² -5y =750

⇒ y(y-5) =750

Valid option.

Therefore, three options for the given area of a rectangular room is 750 square feet and the relation between width and length is equal to :

b. y² -5y =750

c. 750 – y(y – 5) = 0

e. (y + 25)(y – 30) = 0

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In order to determine if the point (20,13) is on the line, it is necessary to write the equation of the line.

The general form of a linear equation is:

y = mx + b

where b is the y-intercept and m is the slope. Y-intercept is the value of y when x = 0. You can observe in the graph that b = 3.

The slope m is conputed by using the following formula:

where (x1,y1) and (x2,y2) are two points of the line. Use the points (0,3) and (6,6), you can select any other two points. Replace these values into the formula for m:

Then, the equation of the line is:

Now, replace the value of x = 20 in the previous equation, if y = 13, then the point (20,13) in on the line:

Hence, the point (20,13) is on the line