In a population of bats living in a certain region, 30 percent have a wingspan greater than 10 inches. In a random sample of 80 bats living outside of the region, 20 had a wingspan greater than 10 inches. Consider a one-sample z-test to investigate whether there is evidence that the proportion of bats with a wingspan greater than 10 inches living outside the region is different from that of the bats living in the region. Which of the following is the correct test statistic?
answer choices
z=\frac{0.30-0.25}{\sqrt{\frac{\left(0.25\right)\left(0.75\right)}{80}}}
z= 80
(0.25)(0.75)
​
​
0.30−0.25
​
z=\frac{0.30-0.25}{\sqrt{\frac{\left(0.30\right)\left(0.70\right)}{80}}}
z= 80
(0.30)(0.70)
​
​
0.30−0.25
​
z=\frac{0.25-0.30}{\sqrt{\frac{\left(0.25\right)\left(0.75\right)}{80}}}
z= 80
(0.25)(0.75)
​
​
0.25−0.30
​
z=\frac{0.25-0.30}{\sqrt{\frac{\left(0.25\right)\left(0.75\right)}{80}}}
z= 80
(0.25)(0.75)
​
​
0.25−0.30
​
z=\frac{0.25-0.30}{\sqrt{\frac{\left(0.30\right)\left(0.70\right)}{80}}}
z= 80
(0.30)(0.70)
​
​
0.25−0.30
​

The side length of the original cube is 8.90 inches

Let x be the side length of the original cube. After cutting off the top, the remaining rectangular box has dimensions of x-5, x-5, and x.

The volume of this rectangular box is:

(x-5)(x-5)(x) = x³ - 10x² + 25x

x³ - 10x² + 25x = 135

x³ - 10x² + 25x -135 = 0

Use cubic formula.

x =8.90

Therefore, the side length of the original cube is 8.90 inches

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Answer:

Step-by-step explanation:

If its going by 4 each time then it should be 21 but for n its 6

There can be one valid triangle created from the given conditions of side a being 5 and angles b and c being 30 and 50 degrees respectively.

To calculate how many triangles can be created from two angles and a side, the user must click the “calculator” tab. Once this is done, it is important to click the “clear” button to begin a new calculation. After this, the user must enter the side (a) under the “sides” section, and the angles (b and c) under the “angles” section. This example used 5 for the side, 30 for angle b, and 50 for angle c. Once the information is entered, the user must click “calculate”. This will result in a valid triangle being created from the given conditions. It is important to note that if the user entered different values, a different result may be obtained. Therefore it is important to ensure that the values entered are the desired ones. Additionally, if the sum of the angles entered are not equal to 180 degrees, then no valid triangle can be created.

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Charisse needs to stain an area of 174 square feet.

The total surface area of the shed's walls that needs to be stained is the sum of the areas of the four walls, minus the area of the front door.

The area of one wall is 8 feet × 6 feet = 48 square feet.

Since there are 4 walls, the total area of all walls is 48 square feet × 4 = 192 square feet.

The area of the front door is 3 feet  × 6 feet = 18 square feet

Now we can subtract the area of the door from the total area of all walls:

192 square feet - 18 square feet = 174 square feet

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Answer:Use a graphing utility to graph the function and approximate (to two decimal places) any relative minima or maxima. (If an answer does not exist, enter DNE.)

f

(

x

)

=

x

3

−

3

x

2

−

x

+

3

relative minimum

(

x

,

y

)

=

c

Step-by-step explanation:

The value of the composite function (f + g)(x) = 14x - 3

From the question, we have the following parameters that can be used in our computation:

f(x) = 2x - 1

g(x) = 12x - 2

The composite function (f + g)(x) is calculated as

(f + g)(x) = f(x) + g(x)

Substitute the known values in the above equation, so, we have the following representation

(f + g)(x) = 2x - 1 + 12x - 2

Evaluate the like terms

(f + g)(x) = 14x - 3

Hence, the composite function is (f + g)(x) = 14x - 3

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Complete question

Consider the functions f(x)=2x−1 g(x)=12x −2

Calculate (f + g)(x)

This means E is the same fraction of the b metres above the floor, so is ab/a+b metres above the floor.

What is equal angles ?

Equal angles can be defined as the angles which are equal .

Given ,

The picture shows two ladders propped against facing walls. The end of the first ladder is 5m above the base of the second wall. The second

ladder is 5m above the base of the first wall.

the angles ∠BAD and ∠ADC are alternate angles, and therefore equal. Likewise, angles ∠ABC and BCD are also alternate and therefore equal.

∠BEA and ∠CED are opposite, which means that they are equal. You can see these equal angles in the diagram on the right.

This means that the triangles ABE and DCE have the same angles as each other, and are therefore similar.

so,

This means:

AE/ED=AB/DC=5m/10m=1/2

Therefore AE=1/3 AD.

This means E is 1/3 of the way up from the floor to D, so is at a height of

This means E is 13 of the way up from the floor to D, so is at a height of 10m/ 3=3 1/3m

If instead B is a metres above the floor, then:

AE/ED=AB/DC=a/10

Therefore AE=a/10+a AD.

This means E is the same fraction of the 10m above the floor, so is 10a/10+a metres above the floor.

If instead D is b metres above the floor, then:

AE/ED=AB/DC=a/b

Therefore AE=a/a+b AD.

This means E is the same fraction of the b metres above the floor, so is ab/a+b metres above the floor.

Therefore, This means E is the same fraction of the b metres above the floor, so is ab/a+b metres above the floor.

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A. To find the correlation coefficient, we can use the formula:

r = (n * Σxy - Σx * Σy) / √ ((n * Σx² - (Σx)²) * (n * Σy² - (Σy)²))

Where n is the number of data points.

Plugging in the values for the given data set:

r = (12 * 712.94 - 1451.9 * 511.6) / √ ((12 * 1297.14 - 1451.9²) * (12 * 636.35 - 511.6²))

r = -0.636

So, the correlation coefficient is -0.636.

B. To find the proportion of the variation in y that can be explained by the variation in x, we can use the formula:

r² = r²

r² = (-0.636) ²

r² = 0.40496

So, 40.5% of the variation in y can be explained by the variation in the values of x.

C. To find the regression line,we can use the formula:

y = a + bx

Where a is the y-intercept and b is the slope of the line.

To find b, we can use the formula:

b = (n * Σxy - Σx * Σy) / (n * Σx² - (Σx)²)

Plugging in the values for the given data set:

b = (12 * 712.94 - 1451.9 * 511.6) / (12 * 1297.14 - 1451.9²)

b = -0.856

To find a, we can use the formula:

a = (Σy - b * Σx) / n

Plugging in the values for the given data set:

a = (511.6 - -0.856 * 1451.9) / 12

a = 55.54

So, the regression line is:

y = 55.54 - 0.856x

The negative slope of -0.856 means that as x increases, y decreases, which is consistent with the negative correlation coefficient of -0.636. The y-intercept of 55.54 means that when x is 0, y is predicted to be 55.54.

Complete question:

Run a regression analysis on the following bivariate set of data with y as the response variable.

x y

43.8 54.1

41.3 51.2

35.3 60.1

48.1 44.9

42.8 51.8

44.7 50.8

39.4 56.6

38.2 56.6

40.7 53.5

45.3 51.1

45 46.7

41.1 52.2

A. Find the correlation coefficient and report it accurate to three decimal places.

r = ________________

B. What proportion of the variation in y can be explained by the variation in the values of x? Report answer as a percentage accurate to one decimal place.  (If the answer is 0.84471, then it would be 84.5%...you would enter 84.5 without the percent symbol.)

r² =_______________ %

C. Based on the data, calculate the regression line (each value to three decimal places)

y =___________ x + _______________

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The solution set for the inequality -4≤-2(y-1)<2 is the set of all y-values that make the inequality true.

To graph the solution set, we can begin by plotting the inequality as an inequality on the y-axis, and then identifying the solutions that make the inequality true:

First, we can simplify the left side of the inequality: -4≤-2(y-1)

Next, we can solve for y by isolating y: -4/2≤y-1

Then we can add 1 to both sides of the inequality: -2≤y

Now, we can graph the inequality y ≥ -2, which is a line that is equal to or greater than -2.

On the right side, we have -2(y-1)<2

2(y-1)>-2

y-1>-1

y>-1

So we can graph the inequality y>-1, which is a line that is greater than -1.

So the solution set is the region above the line y=-2 and below the line y=-1. The region is a strip between two lines.

It is important to note that the solution set doesn't include the values of the lines, as the inequality is strict, not inclusive.

According to the given data, the firm in question must be a price-taker, which is a perfectly competitive firm.

A price-taker is basically an individual or a particular company that must accept prices that are prevailing in a market and lacks the market share to be able to influence the market price on its own. All the economic participants can be considered to be price-takers in a market consisting of perfect competition.

In the given data set, the marginal revenue is constant which is very typical for competitive firms. This happens because the market decides the optimal price level and companies do not have much say over the price. This is a way by which they can maximize profits.

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Answer: The commutative property is applied when finding the GCF by  taking the factor that has more than 1 factor other than itself(composite) and multiply them until you can no longer multiply. You then take the factors that are in common and multiply them.

Step-by-step explanation: my teacher made me use this way.

The standard deviation is 4.0, while mean is 10.2.

Data dispersion in regard to the mean is quantified by a standard deviation, or. Data are said to be more closely grouped around the mean when the standard deviation is low and more dispersed when the standard deviation is high.

Mean = 10.2

The standard deviation is 4.0.

Age in the mean is the average age.

Mean = (16 + 10 + 5 + 7 + 13)/5

Mean = 51/5 = 10.2

The variance's square root will reveal the standard deviation.

(16 - 10.2) + (10 -10.2) + (5-10.2) + (7-10.2)+( 13-10.2) ( 13-10.2)

5.8 + 0.2 -5.2 - 3.2 + 2.8

each number into squares

33.64 + 0.04 + 27.04 + 10.24 + 7.84

Variation: 78.8/5 = 15.76

Standard deviation = 3.969 = 4.0.

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The complete question is,

16, 10, 5, 7, 13

What is the porcupines' typical age based on your sample? Where can I find the standard deviation? in a circle tenths of a percent, closest.

On solving the linear equations x + y = 8 and x + 2y = 10, the value for peaches and mangoes is 6 and 2 respectively.

What is a linear equation?

A linear equation is one that has a degree of 1 as its maximum value. No variable in a linear equation, thus, has an exponent greater than 1. A linear equation's graph will always be a straight line.

Let the number of peaches be = x

Let the number of mangoes be = y

Total number of peaches and mangoes Morgan bought = 8

The linear equation for Morgan if she has bought 8 fruits -

x + y = 8 ....(1)

The cost of one peach is = $1

The cost of one mango is = $2

Total amount for Morgan to spend is = $ 10

The linear equation for Morgan if she has $10 to spend -

x + 2y = 10 ....(2)

Subtracting equation (1) from (2) -

x + 2y - (x + y) = 10 - 8

x + 2y - x - y = 2

y = 2

Substituting the value of y in equation (1) -

x + y = 8

x + 2 = 8

x = 8 - 2

x = 6

Now, to check equate the values of x and y in equation (2) -

x + 2y = 10

6 + 2(2) = 10

6 + 4 = 10

10 = 10

The graph is also plotted and it can be seen that the equations intersect at point (6,2).

Therefore, Morgan bought x = 6 peaches and y = 2 mangoes.

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The amount in the account after 6 years if the account is compounded semiannually, quarterly, or monthly is 6724.4,  6736.7, and 6664.9.

What is compound interest?

Compound interest, also known as interest on principal and interest, is the practice of adding interest to the principal amount of a loan or deposit.

Here, we have

Given: A principal of $5000 is invested in an account paying an annual rate of 7%.

We have to find the amount in the account after 6 years if the account is compounded semiannually, quarterly, or monthly.

A) Compounded semi-annually:

 = 5000*(1 + 0.05/2)^(2*6) = 6724.4

B) Compounded quarterly:

 = 5000*(1 + 0.05/4)^(4*6) = 6736.7

C) Compounded monthly:

 = 5000*(1 + 0.05/12)^(12*6) = 6664.9

Hence, the amount in the account after 6 years if the account is compounded semiannually, quarterly, or monthly is 6724.4,  6736.7, and 6664.9.

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The value of a sub n, we must start with the previous value of a sub n minus 1, and then add four to it.

a_n = a_n-1 + 4

This formula is used to represent the recursive definition of a subscript n baseline. The formula is read as "a sub n is equal to a sub n minus 1 plus 4". This means that in order to find the value of a sub n, we must start with the previous value of a sub n minus 1, and then add four to it.

For example, let's say we want to find the value of a sub 5. We can start by looking at the previous value of a sub 4, which is 12. We then add four to 12, giving us 16. Therefore, a sub 5 is equal to 16.

To calculate this in a more general way, we can say that a sub n is equal to 4 times n minus 1, plus the initial value of a sub 1. That is, a sub n is equal to 4 (n-1) + 4. For example, a sub 5 is equal to 4 (5-1) + 4, which is equal to 16.

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The value of y² is 1/5 ln(3+x¹⁰) + C

What is the separation of variables?

Separation of variables, in mathematics, is any of several strategies for rewriting equations so that each of two variables appears on a different side of the problem. These strategies are used to solve ordinary and partial differential equations.

Here, we have

Given: (3+^10)(/) = ^9/

We have to solve the differential equation by using the separation of variables.

Rewrite as y dy = x⁹/3+x¹⁰ dx

As (3+x¹⁰)' = 10x⁹, we solve

y²/2 = 1/10 ln(3+x¹⁰) + C

y² = 1/5 ln(3+x¹⁰) + 2C

Since C is any constant, y²  = 1/5 ln(3+x¹⁰) + C

Hence, the value of y² is 1/5 ln(3+x¹⁰) + C

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The principal amount that Jenna put in the bank is $625.

Borrowers must pay lenders simple interest as a fee in exchange for a loan. Compound interest is excluded from the calculation and just the original principal is used. Simple interest applies to all loans, not just specific ones. Additionally, it refers to the kind of interest that banks give their customers on their savings accounts.

Given interest earned = $125

time = 4 years

rate = 5%

let the principal be p

this is the case of simple interest,

SI = (p*r*t)/100

substitute the values

125 (p* 5 * 4)/100

125 x 100 = p x 20

p = 12500/20

p = $625

Hence principal amount is $625.

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The value of X that is less than 17% of the values is given as follows:

X = 339.

The z-score of a measure X of a variable that has mean symbolized by [tex]\mu[/tex] and standard deviation symbolized by [tex]\sigma[/tex] is obtained by the rule presented as follows:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The mean and the standard deviation for this problem are given as follows:

[tex]\mu = 300, \sigma = 41[/tex]

The value of X that is less than 17% of the measures is X when Z has a p-value of 0.83, so X when Z = 0.955, hence:

0.955 = (X - 300)/41

X - 300 = 0.955 x 41

X = 339.

The problem asks for the value of X that is less than 17% of the values.

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Selecting elements from an ordered sampling frame is a statistical approach used in survey methodology known as systematic sampling and in the given situation (D) systematic sampling would be the best.

Systematic sampling is a statistical technique used in survey methodology that involves choosing components from an ordered sampling frame.

An equiprobability approach is the most typical type of systematic sampling.

This method treats the list's evolution in a cyclical manner, returning to the top after it has been completed.

The sampling process begins with the random selection of one element from the list, followed by the selection of every kth element in the frame, where k is the sampling interval, also known as the skip, and is equal to:
k = N/n.

Therefore, in the given situation (D) systematic sampling would be the best.

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For each month, you will pay $700 in interest.

What is simple interest?

Simple interest is a method of calculating the interest on a loan or investment where the interest is determined based on the initial principal (the original amount of the loan or investment) and a fixed interest rate. The interest is calculated based on the amount of time the principal is invested or borrowed.

The formula for simple interest is:

I = Prt

Where:

I is the interest

P is the principal

r is the annual interest rate (expressed as a decimal)

t is the time (in years)

For example, if you have a home mortgage of $140,000 with a fixed APR of 6% for 30 years, the simple interest calculation for each month will be:

I = (140,000 x 0.06) / 12 = $700

Hence, for each month, you will pay $700 in interest.

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The range of the function h(x) is -

"all real numbers greater than or equal to -2​"

        [tex]${\displaystyle \forall x\in X,\forall y\in Y,\forall z\in Y,\quad ((x,y)\in R\land (x,z)\in R)\implies y=z.}[/tex]

        [tex]${\displaystyle \forall x\in X,\exists y\in Y,\quad (x,y)\in R.}[/tex]

Given is a table representing a function.

Range is defined as the set of all possible values of f(x). Therefore, all real numbers greater than or equal to -2​, will belong to the range of the function h(x).

Therefore, the range of the function h(x) is -

"all real numbers greater than or equal to -2​"

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The surface area of the hexagonal pyramid is S = 575.9 inches²

The total surface area is the summation of the areas of the base and the three other sides. A = B + ( 1/2 ) ( P x h ), where B is the area of the base of the pyramid, P is the perimeter of the base, and h is the slant height of the pyramid

Surface Area of Pyramid = B + ( 1/2 ) ( P x h )

Given data ,

Let the surface area of the hexagonal pyramid be S

Now , the equation will be

The base of the hexagonal pyramid a = 10 inches

The height of the lateral face h = 6 inches

The base area of the pyramid = ( 3√3 / 2 )a²

The lateral surface area of the pyramid = 3a √ ( ( 3a²/4 ) + h² )

So , The total surface area of hexagonal pyramid is S

S = ( 3√3 / 2 )a² + 3a √ ( ( 3a²/4 ) + h² )

Substituting the values in the equation , we get

The base area of the pyramid = 259.8 inches²

The lateral surface area of the pyramid = 3 ( 10 ) √ ( 3 ( 100/4 ) + 36 )

On simplifying the equation , we get

The lateral surface area of the pyramid = 316.1 inches²

Total surface area of hexagonal pyramid S = 259.8 inches² + 316.1 inches²

The total surface area of hexagonal pyramid S = 575.9 inches²

Hence , the surface area of the pyramid is 575.9 inches²

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To simplify the inequality, we need to perform the same mathematical operation on both sides of the inequality.

V-7 > 24

Add 7 to both sides of the inequality:

V > 31

So, the simplified inequality is V > 31.

The trip would have taken 8.89 hours instead of 8 hours.

Distance traveled can be calculated by multiplying the speed at which the object is traveling by the amount of time the object has been in motion.

For example, if a car is traveling at 60 miles per hour for two hours, the distance traveled would be 120 miles.

To calculate distance more accurately, you can use the formula d = rt, where d is the distance, r is the rate of speed, and t is the time in which the object has been in motion.

It is important to note that this formula assumes a constant speed throughout the duration of the journey.

It is also important to remember that the unit of measurement used for both the speed and the time must be the same. Therefore, if the speed is in miles per hour, the time must also be in hours.

In order to calculate this, we need to first calculate the time it took for the family to travel the first 600km at 90km/h. This can be calculated using the formula:

Time = Distance / Speed

So, the time it took for the family to travel the first 600km is:

Time = 600km / 90km/h = 6.67 hours

Then, we can calculate the time it would have taken for the family to travel 800km at 90km/h using the same formula:

Time = 800km / 90km/h = 8.89 hours

Therefore, the trip would have taken 8.89 hours, which is 0.89 hours longer than the original trip which took 8 hours.

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The rule for converting a binary number to  Decimal point is to multiply each binary digit by two to the power of its position from the right, and add all the resulting values together. For example, 42 in binary is 101010, so the conversion is 1*2^5 + 0*2^4 + 1*2^3 + 0*2^2 + 1*2^1 + 0*2^0 = 32 + 8 + 2 = 42.

1. Start with the rightmost binary digit (the ones place) and multiply it by 2^0.

2. Move to the next digit to the left (the twos place) and multiply it by 2^1.

3. Continue this process until you reach the leftmost binary digit.

4. Add all the products together to get the decimal equivalent.

For example, 42 in binary is 101010, so the calculations are: 0*2^0 + 1*2^1 + 0*2^2 + 1*2^3 + 0*2^4 + 1*2^5 = 0 + 2 + 0 + 8 + 0 + 32 = 42.

The rule for converting a binary number to decimal is to multiply each binary digit by two to the power of its position from the right, and add all the resulting values together. To do this, start with the rightmost binary digit (the ones place) and multiply it by 2^0. Then move to the next digit to the left (the twos place) and multiply it by 2^1. Continue this process until you reach the leftmost binary digit. Add all the products together to get the decimal equivalent. For example, 42 in binary is 101010, so the calculations are:

0*2^0 + 1*2^1 + 0*2^2 + 1*2^3 + 0*2^4 + 1*2^5 = 0 + 2 + 0 + 8 + 0 + 32 = 42.

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The length of the pile of the piece of woods put together by Luke would be = 5.8ft

A pile of objects such as wood is defined as the combination of two or more different parts of the object in an orderly form.

The number of woods stacked by Like = 7

The length of each wood = 10/12ft

Therefore the length of the whole pile of wood ;

= 7×10/12

= 70/12

= 5.8ft

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Answer:

Step-by-step explanation:

Answer:

244.5

Step-by-step explanation:

Use A Budgeting Calc This Anwser Is Correct

Answer:

216

Step-by-step explanation:

2017-2007=10

8*10=80

80% of 120= 96

120+96=216

Answer:

sum of their present ages is 5 + 20 = 25 years.

Step-by-step explanation:

The father's current age is 4x (because he is four times as old as his son)

Five years ago, the father's age was (4x - 5) and the son's age was (x - 5)

Ten years from now, the father's age will be (4x + 10) and the son's age will be (x + 10)

From the second statement, we know that:

(4x - 5) = 1.5(x - 5)

And from the third statement, we know that:

(4x + 10) = 1.5(x + 10)

We can solve these equations simultaneously to find the present ages of the father and the son.

Solving the first equation:

4x - 5 = 1.5x - 7.5

2.5x = 12.5

x = 5

So the son's current age is 5 years old.

The father's current age is 4x = 4(5) = 20 years old.

So, the sum of their present ages is 5 + 20 = 25 years.