A chi-squared test for homogeneity of proportions requires that

A. ni, n2, n3, ... > 30
B. all expected counts are > 5
C. nipi, n2p2, n3p3, ... > 10​

Answer:

Step-by-step explanation:

Hi

Answer:

15

Step-by-step explanation:

The ratio of (the foot of the ladder to the person) : (the person's height) is equal to (the wall to the foot of the ladder) : (the height of the wall) because the triangles are similar. So, if you solve the problem you will get:

(x= the height of the wall)

6:6 = 6+9:x

6:6 = 15:x

1:1=15:x

x=15

The height of the wall is 15 feet.

9514 1404 393

Answer:

  15/28

Step-by-step explanation:

We can rearrange the problem a bit and make it a little simpler.

  1 2/7 - 3/4 = (1 -3/4) + 2/7 = 1/4 + 2/7

  = (7+4·2)/(4·7) = 15/28

_____

The sum of fractions can always be found by ...

  [tex]\dfrac{a}{b}+\dfrac{c}{d}=\dfrac{ad+bc}{bd}\\\\\dfrac{1}{4}+\dfrac{2}{7}=\dfrac{1\cdot7+4\cdot2}{4\cdot7}=\dfrac{7+8}{28}=\dfrac{15}{28}[/tex]

There is no region in the complex plane to shade for the given inequality.

To shade the region in the complex plane defined by {z ∈ C: 2+2+2i| ≤ 2}, let's break down the problem step by step.

The inequality given is: |2+2+2i| ≤ 2

First, let's simplify the expression within the absolute value:

2 + 2 + 2i = 4 + 2i

The inequality now becomes: |4 + 2i| ≤ 2

To find the absolute value of a complex number z = a + bi, we use the formula: |z| = √(a² + b²)

Applying this formula to our complex number, we have:

|4 + 2i| = √(4² + 2²) = √(16 + 4) = √20 = 2√5

Now the inequality becomes: 2√5 ≤ 2

To solve for √5, we divide both sides of the inequality by 2:

√5 ≤ 1

Since the square root of 5 is approximately 2.236, and it is not less than or equal to 1, the inequality is not satisfied.

Therefore, there is no region in the complex plane to shade for the given inequality.

Learn more about complex number click;

https://brainly.com/question/20566728

#SPJ4

Answer:

3,360 different codes.

Step-by-step explanation:

Here we have a set of 8 numbers:

{0, 0, 1, 5, 8, 9, 9, 9}

Now we want to make an 8th digit code with those numbers (each number can be used only once)

Now let's count the number of options for each digit in the code.

For the first digit, we will have 8 options

For the second digit, we will have 7 options (because one was already taken)

For the third digit, we will have 6 options (because two were already taken)

you already can see the pattern here:

For the fourth digit, we will have 5 options

For the fifth digit, we will have 4 options

For the sixth digit, we will have 3 options

For the seventh digit, we will have 2 options

For the eighth digit, we will have 1 option.

The total number of codes will be equal to the product between the numbers of options for each digit, then we have that the total number of codes is:

N = 8*7*6*5*4*3*2*1 = 8!

But wait, you can see that the 9 is repeated 3 times (then we have 3*2*1 = 3! permutations for the nines), and the 0 is repeated two times (then we have 2*1 = 2! permutations for the zeros).

Then we need to divide the number of different codes that we found above by 3! and 2!.

We get that the total number of different codes is:

C = [tex]\frac{8!}{2!*3!} = \frac{8*7*6*5*4}{2} = 8*7*6*5*2 = 3,360[/tex]

3,360 different codes.

The number of eight digit code she can make is, 3360.

If any number have n digits, then number of ways it can be arranged = [tex]n![/tex]

Given that,  Born date is,  08/05/1999

Total number of digits in birth date =  8

So, number of ways it can be arranged = [tex]8![/tex]

Since, In birth date 9 is three times and 0 is two times.

Therefore, number of arrangements = [tex]\frac{8!}{3!*2!}=3360[/tex]

Therefore, she can make 3360 eight digit codes from given birth date.

Learn more:

https://brainly.com/question/24115376

To interpolate the function f(x) = x ln(2+1) by a second-order polynomial on equidistant nodes on the interval (0,1), we can use the Lagrange interpolation formula.

To interpolate f(T) by a second-order polynomial on equidistant nodes on (0,1), we need three equidistant nodes. Let's denote these nodes as x₀, x₁, and x₂, with x₀ = 0, x₁ = h, and x₂ = 2h, where h = (1-0)/2 = 1/2.

We can construct the Lagrange polynomial P₂(x) of degree 2 that interpolates f(x) at these nodes. The Lagrange interpolation formula for P₂(x) is:

P₂(x) = f(x₀) × L₀(x) + f(x₁) × L₁(x) + f(x₂) × L₂(x)

where L₀(x), L₁(x), and L₂(x) are the Lagrange basis polynomials.

Using the given function f(x) = x ln(2+1), we can evaluate f(x₀), f(x₁), and f(x₂). Plugging these values into the Lagrange interpolation formula, we obtain the second-order polynomial interpolation for f(T).

To estimate the error, we can use the error formula for polynomial interpolation. The error term E(x) is given by:

E(x) = f(x) - P₂(x)

To calculate the error, we would need to evaluate the derivative of f(x) and find its maximum value on the interval (0,1). However, without knowing the interval (T), we cannot estimate the error.

In summary, we can interpolate f(T) by a second-order polynomial on equidistant nodes on (0,1) using the Lagrange interpolation formula. However, without specifying the interval (T), it is not possible to estimate the error.

Learn more about polynomial here:

brainly.com/question/11536910

#SPJ11

Answer:

use the link it helps alot

Answer:

The two numbers that multiply to -5 and add to 4 are:

5 and -1

Step-by-step explanation:

5 • -1= -5

5 - 1= 4

Answer:

24

Explanation: base times height divided by 2

Answer:

D) 24

Step-by-step explanation:

Area of a triangle:

A = 1/2bh

Given:

b = 12

h = 4

Work:

A = 1/2bh

A = 1/2(12)(4)

A = 6(4)

A = 24

The relation ‘equal to’ is an equivalence relation on A.

a) To give an example of an onto function f: A → B, we need to ensure that every element in set B is mapped to from set A. Since set B has three elements (5, 6, 7) and set A has four elements (1, 2, 3, 4), it is impossible to have an onto function from A to B.

This is because there are more elements in A than in B, so at least one element in B will not have a corresponding element in A.

b) A function g: A → B is a one-to-one function if each element of set A is paired with a distinct element in set B. Let us create a table to get the one-to-one function g.

Table of one-to-one function gA1234B5677The function g: A → B can be defined by g(1) = 5, g(2) = 6, g(3) = 7 and g(4) = 7.

Hence, this is a one-to-one function.

c) An equivalence relation is a relation that is reflexive, symmetric, and transitive.

We can define an equivalence relation on set A using the relation ‘equal to’. Every element of set A is equal to itself, i.e., ∀ a ∈ A, a = a.

Hence, this is a reflexive relation on A. Also, if a and b are two elements of A such that a = b, then b = a.

Hence, this is a symmetric relation on A. Also, if a, b, and c are three elements of A such that a = b and b = c, then a = c. Hence, this is a transitive relation on A.

To learn more about : equivalence relation

https://brainly.com/question/15828363

#SPJ8

By using the Pythagorean theorem, we calculate that we need 38 feet of line You would need an extra foot on either end for attaching the line to the fence.

To find the length of the line needed, you can use the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the line) is equal to the sum of the squares of the other two sides.

In this case, the two sides are the length (20 feet) and the width (30 feet) of the backyard. The line represents the hypotenuse.

Using the Pythagorean theorem, we can calculate the length of the line:

Line = √(Length² + Width²)

Line = √(20² + 30²)

Line = √(400 + 900)

Line = √1300

Line ≈ 36.06 feet

Since you need to add an extra foot on either end, the total length of the line needed would be:

Total length = Line + 2 feet

Total length ≈ 36.06 feet + 2 feet ≈ 38.06 feet

Rounding to the most appropriate whole number, you would need approximately 38 feet of line.

To know more about Pythagoras' theorem refer-

https://brainly.com/question/21926466#

#SPJ11

Answer:

Every week, the radioactivity decreases by a factor of 5

After 1 week, it goes from 5,000 to 1,000

2 weeks  1,000 / 5 =200

3 weeks 200 / 5 = 40

4 weeks 40 / 5 = 8

5 weeks 8 / 5 = 1.6

6 weeks 1.6 / 5 = 0.064

7 weeks 0.064 / 5 = 0.0128

8 weeks .0128 / 5 = 0.00256

9 weeks 0.00256 / 5 = 0.000512

10 weeks 0.000512 / 5 = 0.0001024

Step-by-step explanation:

Answer:

It is 8/3125

      8

   3125

Step-by-step explanation:

It is the second option

Answer: D. There are at least two oatmeal cookies next to each other.

Step-by-step explanation:

Alright so basically we can use process of elimination to determine what is true or false so

A. States the farthest to the left is chocolate but we can't prove that because all we know is the cookie farthest to the right is chocolate so this is false

B. Same reason as A we cannot prove what cookie is farthest to the left because we are not given a pattern so B is false

C. Since there are definitely twice as many girls as boys in the class and that also means there are twice as many oatmeal cookies then we cannot prove that 2 chocolate cookies have to be next to each other so also false

D. This has to be true because if there are twice as many girls as boys and more oatmeal than chocolate then is whatever cookie line combinataion we will have at least 2 oatmeal cookies next to each other So this is true

E. This is most definitely not true because the question tells us that twice as many girls gave him oatmeal so if anything there are more oatmeal cookies

Answer:

True

Step-by-step explanation:

Answer:

Hi! The other answer is not correct to your question

The answer to your question is n= [tex]\frac{dc}{(c+d)(c-d)}[/tex]

Step-by-step explanation:

Solve the rational equation by combining expressions and isolating the variable n

※※※※※※※※※※※※※※※

⁅Brainliest is greatly appreciated!⁆

- Brooklynn Deka

Hope this helps!!

Jennifer’s gross pay for the year was $32,854. B: She paid $3,982.48 in federal income tax. C:$1,971.24, D:$476.38, E: $2,447.62.

We have given the images

We have to determine the statements a,b,c,d e, and f.

A tax is a compulsory financial charge or some other type of levy imposed on a taxpayer by a governmental organization in order to fund government spending and various public expenditures.

A: Jennifer’s gross pay for the year was $32,854.

B: She paid $3,982.48 in federal income tax.

C:$1,971.24

D:$476.38

E: $2,447.62

F:Jennifer will receive a refund. She will receive $231.48 in her tax refund because her income is $32,854 and she filed for taxes under the status that she is single so she only needs to pay $3,751 in Taxes but she ended up paying $3,982.48 which is $231.48 over how much she should’ve paid.

To learn more about the tax visit:

https://brainly.com/question/9437038

#SPJ2

Answer: uhhhhhhhhhhhhhhhhhhh whats the question?

Step-by-step explanation:

Answer:

9 units

Step-by-step explanation:

got it right on edg

Incorrect. We are 95% confident that the interval from 26.2 and 27.4 captures the BMI of all young American women is the correct interpretation of the confidence interval.

A 95% confidence interval is a range of values that we can be 95% sure contains the true mean of the population. The 95% confidence interval for the mean body mass index (BMI) of young American women is 26.8 ± 0.6.

This means that we are 95% confident that the true mean BMI of young American women is between 26.2 and 27.4.

Consequently, the statement, "The mean BMI of young American women cannot be 28" is incorrect as the confidence interval does not include the value 28.

However, this does not imply that the true mean BMI of young American women cannot be 28.

A confidence interval is a statistical range that provides an estimate of the possible values for an unknown population parameter, such as a mean or proportion, based on a sample from that population. It provides a range of values within which the true population parameter is likely to fall, along with a specified level of confidence.

Visit here to learn more about confidence interval brainly.com/question/32546207

#SPJ11

Answer:

I believe the answer is y=4x+4

Step-by-step explanation:

because the 4 that is on the  Y axis is the Y axis

and the 4 on the x axis will be the one with the variable

Hopefully this helps.

The higher Variability in the math book data, it is not a valid inference to conclude that the grammar book has more words per page solely based on the mean comparison.

Based on the given information, the valid inference would be:

d) No, because the mean is larger in the grammar book.

The mean number of words per page in the grammar book is 49.7, while the mean number of words per page in the math book is 34.5. Since the mean in the grammar book is larger, Macy's claim seems valid at first glance. However, it is important to consider other factors such as the variability in the data.

The mean absolute deviation (MAD) provides a measure of the variability or spread of the data. In this case, the MAD for the grammar book is 18.4, while the MAD for the math book is 41.9. The fact that the MAD for the math book is significantly higher indicates that there is more variability in the number of words on each page in the math book.

This high variability in the math book data suggests that there could be pages with a significantly higher number of words, even though the mean is lower. On the other hand, the lower MAD for the grammar book suggests that the number of words per page in the grammar book is more consistent.

Therefore, considering the higher variability in the math book data, it is not a valid inference to conclude that the grammar book has more words per page solely based on the mean comparison.

To know more about Variability .

https://brainly.com/question/12872866

#SPJ8

Using the identities to find values of the sine and cosine functions of the function the angle measure,

cos 2x = 1

sin 2x = -8√17/17.

Given that tan x = -4, we can determine the values of cos 2x and sin 2x.

Using the identity tan x = sin x / cos x, we have sin x = -4 cos x.

Now, we can use the Pythagorean identity sin² x + cos² x = 1 to solve for cos x:

(-4 cos x)² + cos² x = 1

16 cos² x + cos^2 x = 1

17 cos² x = 1

cos² x = 1/17

cos x = ± √(1/17)

Since we know that cos x > 0, we take cos x = √(1/17).

Next, we can find sin x using sin x = -4 cos x:

sin x = -4 × √(1/17) = -4/√17 = -4√17/17.

Now, we can find cos 2x and sin 2x using the double angle identities:

cos 2x = cos² x - sin² x = (1/17) - (-16/17) = 17/17 = 1

sin 2x = 2 sin x cos x = 2 × (-4√17/17) × √(1/17) = -8√17/17.

Therefore, cos 2x = 1 and sin 2x = -8√17/17.

Learn more about sine and cosine functions at

https://brainly.com/question/29147818

#SPJ4

a) The function gof is gof(x) = 3x + 3.

b) The function gof: RR is well-defined.

a. The value of function gof(x) = 3x + 3.

To find the composition gof, we substitute the expression for g into f:

gof(x) = f(g(x))

= f(x + 1)

= 3(x + 1)

= 3x + 3

b. To prove that gof is both one-to-one and onto, we need to show the following:

(i) One-to-one: For any two different inputs x1 and x2, if gof(x1) = gof(x2), then x1 = x2.

(ii) Onto: For every y in the range of gof, there exists an x such that gof(x) = y.

Proof of one-to-one:

Let x1 and x2 be two different inputs. Assume that gof(x1) = gof(x2).

Then, 3x1 + 3 = 3x2 + 3.

Subtracting 3 from both sides, we have 3x1 = 3x2.

Dividing both sides by 3, we obtain x1 = x2.

Therefore, gof is one-to-one.

Proof of onto:

Let y be any real number in the range of gof, which is the set of all real numbers.

We need to find an x such that gof(x) = y.

Consider the equation 3x + 3 = y.

Subtracting 3 from both sides, we have 3x = y - 3.

Dividing both sides by 3, we obtain x = (y - 3)/3.

Thus, for any y in the range of gof, we can find an x such that gof(x) = y.

Therefore, gof is onto.

Since gof is both one-to-one and onto, it is a bijection.

To know more about  function refer here:

https://brainly.com/question/30721594

#SPJ11

the volume of the solid within the cone is ρ²(12sin⁴(φ) - 11sin²(φ) + 3) = 0

To find the volume of the solid within the cone and between the spheres using spherical coordinates, we need to determine the limits of integration for the variables ρ, θ, and φ.

In spherical coordinates, we have the following relationships:

x = ρsin(φ)cos(θ)

y = ρsin(φ)sin(θ)

z = ρcos(φ)

Given:

Cone equation: z = 13x² + 3y²

Sphere equation: x² + y² + z² = 4

Plane equation: x + y + z = 25

First, let's determine the limits for the variable ρ:

Since we are dealing with spheres, we can set ρ to range from 0 to the radius of the larger sphere, which is 2.

0 ≤ ρ ≤ 2

Next, let's determine the limits for the variable θ:

The solid lies within the entire range of θ, which is from 0 to 2π.

0 ≤ θ ≤ 2π

Finally, let's determine the limits for the variable φ:

To find the limits for φ, we need to consider the intersection between the cone and the spheres.

1. Intersection of the cone and the larger sphere:

Substituting the equations of the cone and the larger sphere, we get:

13x² + 3y² = 4 - x² - y² - z²

12x² + 4y² + z² = 4

12(ρsin(φ)cos(θ))² + 4(ρsin(φ)sin(θ))² + (ρcos(φ))² = 4

12ρ²sin²(φ)cos²(θ) + 4ρ²sin²(φ)sin²(θ) + ρ²cos²(φ) = 4

ρ²(12sin²(φ)cos²(θ) + 4sin²(φ)sin²(θ) + cos²(φ)) = 4

ρ²(12sin²(φ)(1 - sin²(θ)) + cos²(φ)) = 4

ρ²(12sin²(φ) - 12sin²(φ)sin²(θ) + cos²(φ)) = 4

ρ²(12sin²(φ) - 12sin²(φ)(1 - cos²(θ)) + cos²(φ)) = 4

ρ²(12sin²(φ) - 12sin²(φ) + 12sin²(φ)cos²(θ) + cos²(φ)) = 4

ρ²(12sin²(φ)cos²(θ) + cos²(φ)) = 4

We need to solve this equation for ρ. Simplifying further:

ρ²(12sin²(φ)cos²(θ) + cos²(φ)) = 4

ρ²(12sin²(φ)(1 - sin²(φ)) + cos²(φ)) = 4

ρ²(12sin²(φ) - 12sin⁴(φ) + cos²(φ)) = 4

ρ²(12sin²(φ) - 12sin⁴(φ) + 1 - sin²(φ)) = 4

ρ²(11sin²(φ) - 12sin⁴(φ) + 1) = 4

ρ²(12sin⁴(φ) - 11sin²(φ) + 3) = 0

Since ρ cannot be negative

To know more about spherical coordinates click on below link:

brainly.com/question/4465072#

#SPJ4

The p-value can be calculated to test the null hypothesis that the average running time of HP laptops is 120 minutes against the alternative hypothesis that it is not equal to 120 minutes.

The p-value for testing the hypothesis that the average time for the HP laptops is not equal to 120 minutes can be calculated using a t-test. Given a sample mean of 122 minutes, a sample size of 60, a null hypothesis mean of 120 minutes, and a standard deviation of 25 minutes, we can calculate the t-value and find the corresponding p-value.

To calculate the t-value, we use the formula: t = (sample mean - null hypothesis mean) / (sample standard deviation / sqrt(sample size))

Plugging in the values, we get: t = (122 - 120) / (25 / sqrt(60))

Calculating the t-value, we find t ≈ 0.894

To find the p-value associated with this t-value, we can refer to a t-distribution table or use statistical software. The p-value represents the probability of observing a t-value as extreme as the one obtained, assuming the null hypothesis is true.

Since the p-value (0.757) is greater than the commonly used significance level of 0.05, we fail to reject the null hypothesis. This suggests that there is not enough evidence to conclude that the average running time of HP laptops is significantly different from 120 minutes.

To know more about t-tests , refer here:

https://brainly.com/question/1189751#

#SPJ11

The maximum value of the objective function Z is 1800. The optimal values for the decision variables are X1 = 10, X2 = 0, and X3 = 0. The constraints are satisfied, and the optimal solution has been reached using the Simplex Method.

To compute the given problem using the Simplex Method, we need to convert it into a standard form.

The standard form of a linear programming problem consists of maximizing or minimizing a linear objective function subject to linear inequality constraints and non-negativity constraints.

Let's rewrite the problem in standard form:

Maximize:

Z = 50X1 + 20X2 + 10X3

Subject to the constraints:

2X1 + 4X2 + 5X3 <= 200

X1 + X3 <= 90

X1 + 2X2 <= 30

X1, X2, X3 >= 0

To convert the problem into standard form, we introduce slack variables (S1, S2, S3) for each constraint and rewrite the constraints as equalities:

2X1 + 4X2 + 5X3 + S1 = 200

X1 + X3 + S2 = 90

X1 + 2X2 + S3 = 30

Now, we have the following equations:

Objective function:

Z = 50X1 + 20X2 + 10X3 + 0S1 + 0S2 + 0S3

Constraints:

2X1 + 4X2 + 5X3 + S1 = 200

X1 + X3 + S2 = 90

X1 + 2X2 + S3 = 30

X1, X2, X3, S1, S2, S3 >= 0

Next, we will create a table representing the initial simplex tableau:

  | X1 | X2 | X3 | S1 | S2 | S3 | RHS |

---------------------------------------

Z  | 50 | 20 | 10 | 0  | 0  | 0  | 0   |

---------------------------------------

S1 | 2  | 4  | 5  | 1  | 0  | 0  | 200 |

---------------------------------------

S2 | 1  | 0  | 1  | 0  | 1  | 0  | 90  |

---------------------------------------

S3 | 1  | 2  | 0  | 0  | 0  | 1  | 30  |

---------------------------------------

To compute the optimal solution using the Simplex Method, we'll perform iterations by applying the simplex pivot operations until we reach an optimal solution.

Iterating through the simplex method steps, we can find the following tableau:

  | X1 | X2 | X3 | S1 | S2 | S3 | RHS |

---------------------------------------

Z  | 0  | 40 | 10 | 0  | 0  | -500| 1800|

---------------------------------------

S1 | 0  | 3  | 5  | 1  | 0  | -40 | 120  |

---------------------------------------

S2 | 1  | 0  | 1  | 0  | 1  | 0   | 90   |

---------------------------------------

X1 | 0  | 2  | 0  | 0  | 0  | -1  | 10   |

---------------------------------------

The optimal solution is Z = 1800, X1 = 10, X2 = 0, X3 = 0, S1 = 120, S2 = 90, S3 = 0.

Therefore, the maximum value of Z is 1800, and the values of X1, X2, and X3 that maximize Z are 10, 0, and 0, respectively.

To know more about Simplex Method refer here:

https://brainly.com/question/30387091#

#SPJ11