We would need to survey at least 600 randomly selected air passengers to be 90% confident that the sample percentage is within 1.5 percentage points of the true population percentage.
what is percentage?As a number out of 100, a percentage is a technique to express a fraction or a proportion. The sign "%" stands in for the word "percent," which is a contraction of "per hundred."
To determine the sample size for the survey, we can use the following formula:
n = [tex](Z^2 * p * q) / E^2[/tex]
Where:
n is the required sample size
Z is the Z-value for the desired confidence level (in this case, Z = 1.645 for a 90% confidence level)
p is the estimated population proportion (we don't know this yet, so we will assume a conservative estimate of 0.5)
q is the complementary probability of p (q = 1 - p)
E is the maximum error or margin of error (in this case, E = 0.015)
Plugging in the values, we get:
n = ([tex]1.645^2[/tex] * 0.5 * 0.5) / [tex]0.015^2[/tex]
n = 599.27
Rounding up to the nearest whole number, we get a required sample size of 600.
Therefore, we would need to survey at least 600 randomly selected air passengers to be 90% confident that the sample percentage is within 1.5 percentage points of the true population percentage.
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A study by the department of education of
a certain state was trying to determine the
mean SAT scores of the graduating high
school seniors. The study examined the
scores of a random sample of 250
graduating seniors and found the mean
score to be 538 with a standard deviation
of 96. Determine a 95% confidence
interval for the mean, rounding all values
to the nearest tenth.
The 95% confidence interval for the mean SAT scores is CI = (526.2, 549.8)
What is confidence interval?It is a statistical tool used in inferential statistics to estimate the unknown population parameter based on the sample data.
According to question:To find the 95% confidence interval for the mean SAT scores, we can use the formula: CI
where:
sample mean (538)
population standard deviation (96)
n = sample size (250)
z = z-score for the desired confidence level (95% confidence corresponds to a z-score of 1.96)
Plugging in the values, we get:
CI = 538 ± 1.96*(96/√250)
Simplifying, we get:
CI = 538 ± 11.8
Rounding to the nearest tenth, the 95% confidence interval for the mean SAT scores is:
CI = (526.2, 549.8)
For example, a 95% confidence interval for a population mean means that if we were to repeat the sampling process multiple times and calculate a 95% confidence interval each time, about 95% of the intervals would contain the true population mean.
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How do you solve the equation absolute value of K +7 equals three
Answer:
k=-4
Step-by-step explanation:
k+7=3
take way 7 from both sides
k=-4
Nathan is driving to a concert and needs to pay for parking. There is an
automatic fee of $8 just to enter the parking lot, and when he leaves
the lot, he will have to pay an additional $2 for every hour he had his
car in the lot. How much total money would Nathan have to pay for
parking if he left his car in the lot for 6 hours? How much would
Nathan have to pay if he left his car in the lot for t hours?
Cost of parking for 6 hours:
Cost of parking for t hours:
Answer:
Nathan would have to pay 20 dollars if he parked for 6 hours.
2t+8
Step-by-step explanation:
What is the nth term for the sequence 1, 8, 15, 22, 29
Answer:
[tex]a_{n}[/tex] = 7n - 6
Step-by-step explanation:
there is a common difference between consecutive terms , that is
8 - 1 = 15 - 8 = 22 - 15 = 29 - 22 = 7
this indicates the sequence is arithmetic with nth term
[tex]a_{n}[/tex] = a₁ + (n - 1)d
where a₁ is the first term and d the common difference
here a₁ = 1 and d = 7 , then
[tex]a_{n}[/tex] = 1 + 7(n - 1) = 1 + 7n - 7 = 7n - 6
Answer:
7n-6
Step-by-step explanation:
Work out the difference of the sequence:
8-1=7
Now you have the first part of the equation: 7n
n is the number that the integer is on the sequence
In this case:
1 = 1 as 1 is the first number of the sequence
And 2 = 8 as 8 is the 2nd number of the sequence
To find the full equation:
Do 7x1 to get you 7
Now see how far the 1st number is from 7
In this case you would do:
7-1 which gives you 6
Since you subtracted it to find the difference, it would be:
- 6
Therefore your answer would be 7n-6
To check it:
Times 7 by let's say 3 to get you 21
Then subtract 6 to get 15.
This is proven right as the 3rd number of the given sequence is 15.
Hope this helped
A sine function has the following key features:
Period = 4
Amplitude = 3
Midline: y=−1
y-intercept: (0, -1)
The function is not a reflection of its parent function over the x-axis.
Use the sine tool to graph the function. The first point must be on the midline and the second point must be a maximum or minimum value on the graph closest to the first point.
The resulting graph should have a period of 4, an amplitude of 3, a midline of y=-1, and no reflection over the x-axis.
What are the period and amplitude of a graph?
The period of a function is the smallest distance over which the function repeats itself. In other words, it is the length of one complete cycle of the function. For a sine or cosine function of the form f(x) = a sin(bx) or f(x) = a cos(bx), the period is given by 2π/b.
The most simple sine function considered the parent function, is:
y = sin(x)
That function has:
Midline, also known as rest or equilibrium position: y = 0
Minimum: - 1
Maximum: 1
Amplitude: the distance between a minimum or a maximum and the midline = 1
period: the interval of repetition of the function = 2π
The more general sine function is:
y = Asin(Bx + C) + D
That function has:
Midline: y = D (it is a vertical shift from the parent function)
Minimum: - A + D
Maximum: A + D
Amplitude: A
period: 2π/B
phase shift: C (it is a horizontal shift of from the parent function)
Now, you have to draw the sine function with the given key features:
Period = 4 ⇒ 2π/B = 4 ⇒ B = π/2
Amplitude, A = 3
midline y = - 1 ⇒ D = - 1
y-intercept = (0, -1)
Substitute the know values and use the y-intercept to find C:
y = 3sin(2x/π + C) -1
Substitute (0, -1)
-1 = 3sin(2(0)/π + C) -1
3sin(C) = 0
sin(C) = 0
C = 0
Hence, the function to graph is:
y = 3sin(2x/π ) -1
To draw that function use this:
Maxima: 3(1) - 1 = 3 - 1 = 2, at x = 1 ± 4n (n = 0, 1, 2, 3, ...)
Minima: 3(-1) - 1 = - 3 - 1 = -4
y-intercept: (0, - 1)
x-intercepts: the solutions to 0 = 3sin(πx/2) = - 1
first point of the midline: (0, -1) it is the same y-intercept
Hence, the resulting graph should have a period of 4, an amplitude of 3, a midline of y=-1, and no reflection over the x-axis.
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Find the product.
a.
b.
8 15 19
7 -4 12
1
-15 19
-12-19
0-13
-600 -760
-114 106
-120 -114
-760
106
C.
d.
-354 -406
-111 27
57 71
3
17
The product of the values can be obtained by multiplying as follows:
1. 8 * 15 * 19 = 2280
2. 7 * -4 * 12 = -41
How to find the product of a valueTo find a product simply means to multiply the figures in order to arrive at a value. The question asks that we get the product of some values. To get these values, we are to multiply the numbers given to arrive at the answers.
It is possible to multiply two, three, or more values at the same time. So, another word that is used in place of multiplication is "product" as is the case in the question given.
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The measures of the angles of a triangle are shown in the figure below. Solve for x.
Answer:
x=14
Step-by-step explanation:
80+58=138
180-138=42
42÷3=x
14=x
Answer:
x= 14
Step-by-step explanation:
80 + 58 = 138°
A triangle has 180°
180-138= 42°
Put into equation
42=3x
42/3=14
X=14
Find the value of t for a t-distribution with 45 degrees of freedom such that the area to the right of t equals 0.010. Round your answer to three decimal places, if necessary.
The value of t for a t-distribution with 45 degrees of freedom such that the area to the right of t equals 0.010 is approximately -2.326.
With its bell-shaped structure and heavier tails, the t-distribution, commonly referred to as the Student's t-distribution, is a kind of probability distribution that resembles the normal distribution. When there are insufficient samples or unknown variances, it is used to estimate population parameters. T-distributions have broader tails than normal distributions because they are more likely to contain extreme values.
To find the value of t for a t-distribution with 45 degrees of freedom such that the area to the right of t equals 0.010, we can use a t-table or a calculator. Using a calculator, we can use the inverse t-distribution function. The inverse t-distribution function gives us the value of t for a given probability and degrees of freedom.
Using this function, we have:
t = invT(0.010, 45) ≈ -2.326
Rounding this to three decimal places gives us the answer:
t ≈ -2.326
Therefore, the value of t for a t-distribution with 45 degrees of freedom such that the area to the right of t equals 0.010 is approximately -2.326.
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Enter an expression equivalent to
d^8
——
d^3
in the form, d^n
From the expression, the form of the d⁵ is provided by the stated assertion.
What does an arithmetic the expression mean?A group of words joined with the actions +, -, x, or form an expression, such as 4 x 3 or 5 x 2 3 x y + 17. A statement containing the equals symbol, such as 4 b 2 = 6, says that two formulas are equivalent in value and is known as an equation.
Describe expression using an illustration.As an illustration, the expression x + y is one where both x and y have words with an addition function in between. There are two kinds of expressions in mathematics: numerical expressions, which only comprise integers, and algebraic expressions, which also include variables.
[tex]d^{(8-3)} = d^5[/tex]
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Enter an expression equivalent to (d^(8))/(d^(3)) in the form, d^(n).
What is 231 3/25 x .75
to follow the order of operations or PEMDAS (parentheses, exponents, multiplication and division, and addition and subtraction) to ensure that we get the correct answer. [tex]231 3/25 \times 0.75 = 4348.5 / 75.[/tex]
What is the improper fraction?To solve this multiplication problem, we can first convert the mixed number 231 3/25 to an improper fraction:
[tex]231 3/25 = (25 \times 231 + 3) / 25 = 5778/25[/tex]
Then, we can multiply this fraction by 0.75:
[tex]5778/25 \times 0.75 = (5778 \times 0.75) / 25[/tex]
To simplify this fraction, we can multiply the numerator and denominator by 3:
[tex](5778 \times 0.75 \times 3) / (25 \times 3) = 4348.5 / 75[/tex]
Therefore, [tex]231 3/25 x\times 0.75 = 4348.5 / 75.[/tex]
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can you solve this question?
x=?
the value of this limit=?
y=?
The derivative of f(x) = 3·x² + 7·x + 6, at x = 4, f'(4) is presented as follows;
f'(4) is the limit as x → 4 of the expression 6·x + 7.
The value of this limit is 31
The equation of the tangent line to the parabola y = 3·x² + 7·x + 6 at the point (4, 82) is y = 31·x - 42
What is the derivative of function?The derivative of a function is a measure of how much the output values of the function changes as the input value is changed. The derivative is the limit of the difference quotient as the change in input approaches zero. The limit is the instantaneous rate of change of the function at a specified input variable value.
The value of f'(4) using the definition of derivative, can be obtained using the following definition;
f'(x) = lim(h → 0)[f(x + h) - f(x)]/h
Plugging in x = 4, and f(x) = 3·x² + 7·x + 6, we get;
f'(4) = lim(h → 0)[f(4 + h) - f(4)]/h
f'(4) = lim(h → 0)[3·(4 + h)² + 7·(4 + h) + 6 - (3·(4)² + 7·(4) + 6)]/h
f'(4) = lim(h → 0)[(3·h + 31)·h]/h
f'(4) = lim(h → 0)[(3·h + 31)]
Therefore;
f'(4) = lim(h → 0)[(3·h + 31)] = 31
f'(4) = 31
Therefore; f'(4) is the limit as x → 4 of the expression 6·x + 7, therefore. The value of this limit is 31
The point-slope form of the equation of a line can be used to find the equation of the parabola as follows;
y - y₁ = m·(x - x₁)
The point (x₁, y₁) and the slope of the line is m
The point on the parabola of the tangent is; (4, 82)
The slope of the tangent line at x = 4, f'(4) = 31
The tangent equation is therefore;
y - 82 = 31·(x - 4)
y = 31·(x - 4) + 82 = 31·x - 42
The equation of the tangent line to the parabola, y = 3·x² + 7·x + 6, at the point (4, 82) is; y = 31·x - 42
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Find the missing numbered angle
(5x-2)
The missing numbered angle is 80 degrees.
In the given diagram, we can see that angles A and B form a linear pair (they are adjacent angles whose sum is 180 degrees). So we can write:
A + B = 180 degrees
Substituting the given value of angle A, we get:
(3x + 10) + B = 180 degrees
Simplifying this equation, we get:
3x + B = 170 degrees
We are also given that angle C is a complementary angle to angle B, which means that angle C + angle B = 90 degrees. We can substitute the value of angle B from the above equation to get:
C + (3x + B) = 90 degrees
Simplifying this equation, we get:
C + (3x + 170 - 3x) = 90 degrees
Simplifying further, we get:
C + 170 = 90 degrees
Subtracting 170 from both sides, we get:
C = 80 degrees
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can you pls answer this for me im really struggling with this
Answer:
The slope of this line is 2.
Step-by-step explanation:
Start at (1, 0). Go up 4 units, then right 2 units. You will end at (3, 4). The slope of this line is 2.
Use point-slope form to write the equation of a line that passes through the point (−11,−13) with slope -2/3 .
Answer:
y + 13 = - [tex]\frac{2}{3}[/tex] (x + 11)
Step-by-step explanation:
the equation of a line in point- slope form is
y - b = m(x - a)
where m is the slope and (a, b ) a point on the line
here m = - [tex]\frac{2}{3}[/tex] and (a, b ) = (- 11, - 13 ) , then
y - (- 13) = - [tex]\frac{2}{3}[/tex] (x - (- 11) ) , that is
y + 13 = - [tex]\frac{2}{3}[/tex] (x + 11)
Will give brainly
Trig
Step-by-step explanation:
angle c = 180 -19 - 139 = 22 degrees ( interior angles of a triangle sum to 180 degrees)
Now you can use law of sines to find the missing side lengths
12 / sin 22 = DC /sin19
DC = sin 19 * 12 / sin 22 = 10.4 units
12/sin 22 = BC / sin 132
BC = sin132 * 12 / sin 22 = 23.8 units
A shuffleboard disk is accelerated to a speed of 5.6 m/s and released. If the coefficient of kinetic friction between the disk and the concrete court is 0.34, how far does the disk go
before it comes to a stop? The courts are 14.3 m long.
Answer:
Therefore, the shuffleboard disk will travel a distance of 4.71 meters before coming to a stop, which is less than the length of the court (14.3 meters).
Step-by-step explanation:
We can start by using the work-energy principle, which states that the net work done on an object is equal to its change in kinetic energy. In this case, we can assume that the initial kinetic energy of the disk is entirely converted to work done by friction, which causes the disk to come to a stop. The equation can be written as:
Work done by friction = Change in kinetic energy
The work done by friction can be calculated using the formula:
Work = force x distance
The force of friction can be found using the formula:
Force of friction = coefficient of friction x normal force
The normal force is equal to the weight of the disk, which can be found using the formula:
Weight = mass x gravity
Substituting the values given in the problem, we get:
Weight = mass x gravity = 0.75 kg x 9.81 m/s^2 = 7.3575 N
Force of friction = coefficient of friction x normal force = 0.34 x 7.3575 N = 2.4985 N
Work done by friction = Force of friction x distance
We can solve for the distance by rearranging the equation as:
Distance = Work done by friction / Force of friction
The initial kinetic energy of the disk can be found using the formula:
Kinetic energy = 0.5 x mass x velocity^2
Substituting the values given in the problem, we get:
Kinetic energy = 0.5 x 0.75 kg x (5.6 m/s)^2 = 11.76 J
Using the work-energy principle, we know that the work done by friction is equal to the change in kinetic energy, which is:
Work done by friction = Kinetic energy = 11.76 J
Substituting this value and the force of friction into the distance formula, we get:
Distance = Work done by friction / Force of friction = 11.76 J / 2.4985 N = 4.71 m
Therefore, the shuffleboard disk will travel a distance of 4.71 meters before coming to a stop, which is less than the length of the court (14.3 meters).
Add 6.034 +10 +0.608
Answer: 16.642
Step-by-step explanation:
I hope this helped you! A brainilist is highly appreciated and helpful! <3
Answer: 16.642
Step-by-step explanation:
10 + 6.034 = 16.034
16.034 + 0.608 = 16.642
Use the definition of a logarithm to solve the equation. ln ( − 5 z ) = ln ( z^ 2 − 7 z )
To solve for z, we can subtract 7 from both sides to get -5/z = -6. Finally, we can multiply both sides by -1 to get z = -7. Therefore, the solution to this equation is z = -7.
A logarithm is an equation that expresses the relationship between an exponent and its base. In this equation, we have two logarithms, ln (-5z) and ln [tex](z^2-7z)[/tex], which are both equal to each other. To solve this equation, we can use the properties of logarithms to isolate the variable. First, we can rewrite the equation as ln (-5z) - ln [tex](z^2-7z)[/tex]= 0, which can then be simplified to ln (-5/z+7) = 0. We can then take the inverse of both sides to get -5/z+7 = 1. To solve for z, we can subtract 7 from both sides to get -5/z = -6. Finally, we can multiply both sides by -1 to get z = -7. Therefore, the solution to this equation is z = -7.
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John ran up and $88 Bill last Saturday the service was excellent so we decided to leave a 30% tip for the waitress how much was his tip
$26.40
ten percent is 88 divided by 10= 8.8
8.8 multiplied by 3 is 26.40
there is 30 students in tthe gym if there are at least 16 girls write an inequalitly
The number of girls in the gym must be: g ≥ 16
How to write the in equality?Let's define the variable "g" to be a representation of the number of girls in the gym.
We know that there are 30 students in total. Therefore, the number of boys in the gym will be:
b = 30 - g
We also know that there are at least 16 girls in the gym. So, we can write the inequality:
g ≥ 16
This inequality means that the number of girls in the gym must be greater than or equal to 16.
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please try to answer all questions below** TYYY
1.The equation that represents the proportional relationship is y = 4x + 3.
2. The corresponding equation that represents a proportional relationship is y = (1/5)x.
3. y = 7/2x.
4. when y = 21 is x = 6.
5. y = 8 is x = 3.33.
What is slope?The slope of a function is the rate of change in the function's output (y-value) relative to the change in its input (x-value).
The equation that represents a proportional relationship is y = mx + b, where m is the slope of the equation.
In this equation, x and y are in direct proportion.
1.The equation that represents the proportional relationship is y = 4x + 3. This equation is in the form of y = mx + b, with m being the coefficient of x, which is 4, and b being the constant, which is 3.
2. The corresponding equation that represents a proportional relationship is y = (1/5)x.
This equation is in the form of y = mx + b, with m being the coefficient of x, which is 1/5, and b being the constant, which is 0.
3. The equation that represents this relationship is y = 7/2x.
This equation is in the form of y = mx + b, with m being the coefficient of x, which is 7/2, and b being the constant, which is 0.
4. The value of x when y = 21 is x = 6.
This is because the equation representing the proportional relationship is y = 7/2x, and
when y = 21, 21 = 7/2x,
so x = 6.
5. The value of x when y = 8 is x = 3.33.
This is because the equation representing the proportional relationship is y = 12/5x, and when y = 8, 8 = 12/5x, so x = 3.33.
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In the diagram below, ABC~ DBE. If AD = 24, DB = 12, and DE = 4, what is the length of
AC?
Answer:
Step-by-step explanation:
because 110
A laboure digs a pit 6.5 m long, 3 m wide and 1.6 m deep. How much earth is du. out from it ?
Answer:
Volume =
Step-by-step explanation:
Volume = length x width x depth
Volume = (6.5 x 3 x 1.6)m
Volume = 31.2m
x^2+10x-1
x^2+8x-2
find the perfect square it should be in (x+/-_)(x+/-_) form
Calculate the area of the shape below
Answer:
[tex]225 \: {m}^{2} [/tex]
Step-by-step explanation:
I added a photo of my notes
This figure is formed from a rectangle and a trapezoid
Since the opposite sides of a rectangle are equal, we can find the its area:
A (rectangle) = 9 × 17 = 153 m^2
In order to find the area of a trapezoid, we have to know the length of its altitude:
H = 15 - 9 = 6 m
We know the lengths of both bases, now we can find the area:
A (trapezoid) = 0,5(7 + 17) × 6 = 0,5 × 24 × 6 = 12 × 6 = 72 m^2
Now add these two areas together and we'll get the total area of this figure:
A = 153 + 72 = 225 m^2
Porter is buying t ride tickets at the country fair. He spends d dollars and receives 3 tickets for every dollar he spends. Which is the independent variable and which is the dependent variable?
The independent variable and the dependent variable are the number of dollars spent and the number of tickets bought
How to determine the independent variable and the dependent variable?Given that we have the following statement:
Porter is buying t ride tickets at the country fair. He spends d dollars and receives 3 tickets for every dollar he spends.The independent variable is the input value
i.e. the number of dollars spent
Similarly, the dependent variable is the output value
i.e. the number of tickets bought
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f(x)=3x^3+5x^2-11x+3
Polynomials are functions that are constructed from a sum of powers of the independent variable x, multiplied by coefficients. In this case, we have powers of x from 0 to 3, and the coefficients are 3, 5, -11, and 3.
To evaluate the function for a particular value of x, we substitute that value in place of x and perform the necessary arithmetic. For example, to find f(2), we substitute x = 2 in the expression for f(x):
f(2) = 3(2)^3 + 5(2)^2 - 11(2) + 3
= 24 + 20 - 22 + 3
= 25
Therefore, f(2) = 25. We can similarly evaluate the function for other values of x.
Is 4p + 7n+ 3p and 14pn equal
Answer:
yes
Step-by-step explanation:
4p+ 3p= 7p
7p+7n=14pn
Simplify (Write each expression without using the absolute value symbol)
|x+3| if x>5
we can simplify |x+3| to x+3 when x is greater than 5. This is the final answer.The absolute value of a number is the distance of the number from zero on a number line, regardless of whether the number is positive or negative.
For example, the absolute value of -5 is 5, because 5 is the distance of -5 from zero on the number line.
In this problem, we are asked to simplify the expression |x+3| without using the absolute value symbol. We are also given the condition that x is greater than 5.
When x is greater than 5, we know that x+3 is also greater than 5+3=8. This is because x is already greater than 5, and adding 3 to it makes it even larger. So, we can say that x+3 is positive when x is greater than 5.
Now, let's consider what the absolute value of x+3 means in this context. Since x+3 is positive when x is greater than 5, the absolute value of x+3 is just x+3 itself. This is because the absolute value of a positive number is just the number itself.
Therefore, we can simplify |x+3| to x+3 when x is greater than 5. This is the final answer.
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Which table shows values for the equation y=3x+2
?
Answer:
Answer is option D
Step-by-step explanation:
Hope this helps:)