The t-statistic for this hypothesis test will be 1.50 as "the average flight time for the pilots is found to be 8.12 hours. the standard deviation reported by the faa is 0.72 hours, and there were 81 pilots in the sample."
What is test statistic?A statistic used in statistical hypothesis testing is known as a test statistic. A test statistic, which can be thought of as a numerical summary of a data set that condenses the data into a single value that can be used to conduct the hypothesis test, is how a hypothesis test is typically expressed. A number derived from a statistical test of a hypothesis is the test statistic. It displays how closely your actual data match the distribution predicted by the statistical test's null hypothesis.
Here,
test statistic t is,
t = (x' - μ)/(σ/√n)
x'=8.12 hours
μ=8 hours
σ=0.72 hours
n=81 pilot
t=(8.12-8)/0.72/(√81)
=0.12/0.08
t=1.5
For this hypothesis test, the t-statistic will be 1.50 as "The pilots' average flight time was found to be 8.12 hours. There were 81 pilots in the sample, and the faa reported a standard deviation of 0.72 hours."
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help!!!!!!!!!!!!!!!!
Answer:
Step-by-step explanation:
5/6 is closest to 1 and 2/5 is closest to 1/2 so the difference is closest to 1/2.
Which answer is correct?
(A)4x + y = 6
−2x + y = −5
(B)x + y = 8
2x − 9y = 4
(C)x − 4y = −6
−2x − y = 5
(D) −x + y = 9
9x + 2y = 4
The graph shown has two straight lines and the correct equation is
(A) 4x + y = 6−2x + y = −5What is linear function?A linear function consists of functions where the variables has exponents of 1.
The graph of linear functions is a straight line graph and the relationship is expressed in the form.
y = mx + c
y = output variable
m = slope
x = input variable
c = y intercept
interpretation of the equations
4x + y = 6 ⇒ y = -4x + 6
m = -4
c = 6
from the graph only one the lines has the y intercept as 6, also the slope is negative. the line shown by at option (c) the intercept is 6/4 and the slope is positive
−2x + y = −5 ⇒ y = 2x - 5
m = 2x
c = -5
The c is not showing here but it is moving towards negative. the x intercept is showing and we can use it to confirm
y = 2x - 5
0 = 2x - 5
2x = 5
x = 2.5
this coincides with the point on the graph (2.5, 0)
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23% of $52 is $???? Answer needs a decimal
Answer:
$11.96
Step-by-step explanation:
Now we have to,
→ find 23 percent of $52.
Let's solve the problem,
→ 23% of $52
→ (52/100) × 23
→ 0.52 × 23
→ $11.96
Hence, answer is $11.96.
3. Another bank offers 1.9% annual simple interest for deposits of $10,000 or more. Carter opened an account at this bank with an initial deposit of $12,000. Ruth opened a Deluxe Savings account that same day. If they have both earned the same amount in interest after one year, what was the amount of Ruth's initial deposit?
Ruth must have an initial deposit of $12000 in order to have the same simple interest at the same rate within the same time as Carter
Simple InterestSimple Interest (S.I) is the method of calculating the interest amount for some principal amount of money. Simple interest is a quick and easy method of calculating the interest charge on a loan. Simple interest is determined by multiplying the daily interest rate by the principal by the number of days that elapse between payments.
The formula of simple interest is given as
S.I = PRT
p = principal amountr = ratet = timeWe can set up equivalent equations since both interest are equal.
S.I = P(1 + RT)
S.I = 12000(1 + 0.019 * 1)
S.I = 12228
But since they earned the same interest at the same rate within the same period, their principal or initial amount invested must be equal
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Calculus Ladder Sliding Down
Answer:
[tex]\left.\dfrac{\text{d}x}{\text{d}t}\right|_{h=2}\approx0.184\; \sf m/s[/tex]
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{9 cm}\underline{Pythagoras Theorem} \\\\$a^2+b^2=c^2$\\\\where:\\ \phantom{ww}$\bullet$ $a$ and $b$ are the legs of the right triangle. \\ \phantom{ww}$\bullet$ $c$ is the hypotenuse (longest side) of the right triangle.\\\end{minipage}}[/tex]
Given variables:
a = length of the ladder.h = height of the ladder's top at time t.x = distance of the ladder from the wall at time t.Given a = 8.9, use Pythagoras Theorem to create an equation for x² in terms of h²:
[tex]\implies x^2+h^2=a^2[/tex]
[tex]\implies x^2+h^2=8.9^2[/tex]
[tex]\implies x^2+h^2=79.21[/tex]
[tex]\implies x^2=79.21-h^2[/tex]
Differentiate with respect to h:
[tex]\implies 2x\dfrac{\text{d}x}{\text{d}h}=0-2h[/tex]
[tex]\implies \dfrac{\text{d}x}{\text{d}h}=-\dfrac{2h}{2x}[/tex]
[tex]\implies \dfrac{\text{d}x}{\text{d}h}=-\dfrac{h}{x}[/tex]
Given:
[tex]\dfrac{\text{d}h}{\text{d}t}=-0.8\; \sf m/s[/tex]
Therefore:
[tex]\begin{aligned} \dfrac{\text{d}x}{\text{d}t}&=\dfrac{\text{d}x}{\text{d}h}\times \dfrac{\text{d}h}{\text{d}t}}\\\\ \implies &=-\dfrac{h}{x} \times -0.8\\\\ &=\dfrac{0.8h}{x} \end{aligned}[/tex]
Calculate x when h = 2:
[tex]\implies x^2=79.21-2^2[/tex]
[tex]\implies x^2=79.21-4[/tex]
[tex]\implies x^2=75.21[/tex]
[tex]\implies x=\sqrt{75.21}[/tex]
Substitute the values of h and x into the equation for dx/dt:
[tex]\implies \dfrac{\text{d}x}{\text{d}t}=\dfrac{0.8 \times 2}{\sqrt{75.21}}=0.1844939751[/tex]
Therefore, the rate of the ladder's distance from the wall is 0.184 m/s (3 d.p.)
Find a description this equation represents. Of the numbers 1, 2, 3, 4, and 5, which are solutions to the equation?
4x+6=18
A. If you add four to six times a number, you get 18.
B. Four more than six times a number is 18.
C. If you add six to four times a number, you get 18.
D. Six more than four times a number is 18.
E. Six less than four times a number is 18.
F. Four less than six times a number is 18.
G. If you add six times a number to four, you get 18.
H. If you subtract six from four times a number, you get 18.
Please help, what is the common side of the triangles ABC and DCB?
BC is the common side of both the triangles.
Answer:
BC
Step-by-step explanation:
Common side in both triangles is BC
Sides of ΔABC,
AB ; BC and AC
Sides of ΔDCB,
DC, BC and DB
Find g(x), where g(x) is the translation 2
units left of f(x)= -5x + 5.
Answer:
g(x)=(-5x+2)+5
Step-by-step explanation:
Solve:
2000(2000^2000)
(A) 2000^2001
(B) 4000^2000
(C) 2000^4000
(D) 4,000,000^2000
(E) 2000^4,000,000
PLEASE ANSWER ASAP!!!
Answer:
They all come out to be infinity
The distance (D) that a spring is stretched by a hanging object varies directly as the
weight (W) of the object. If a 6-kg object stretches a spring 29 cm, how far will a 25- kg weight stretch the spring?
Pls help asap! Tysm if u do!
The 25 Kg weight will stretch the spring 120.84 cm .
In the question ,
it is given that
the distance(D) that spring stretches by hanging objects vary directly to the weight(W) of the object .
which means
D ∝ W
to remove the proportionality sign , we write the constant k
So, D = k × W ,
where k is the constant of proportionality
given that 6 Kg weight stretches the spring 29 cm
So,
29 = k * 6
k = 29/6
to find the stretch for 25 Kg weight
D = (29/6)*25
D = 120.84 cm
Therefore ,The 25 Kg weight will stretch the spring 120.84 cm .
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scores on a standard iq test for people aged 20 to 34 are normally distributed with mean 110 and standard deviation 25. what is the probability that a randomly selected young adult will score between 85 and 160 on this iq test? round your answer to four decimal places.
The probability that a young adult chosen at random will achieve an IQ between 85 and 160 is 0.8185.
The problem states that;
A typical IQ test result for individuals between the ages of 20 and 34 has a mean of 110 and a standard deviation of 25, and the values are regularly distributed.
To get the probability that a randomly selected young adult will score between 85 and 160 on this IQ test.
Let,
P(85 < x < 160) = P[ (85 - 110)/ 25) < (x - μ) / σ < (160 - 110) / 25) ]
= P(-1 < z < 2)
= P(z < 2) - P(z < -1)
= 0.9772 - 0.1587
= 0.8185
Therefore, the probability that a randomly selected young adult will score between 85 and 160 on this IQ test is 0.8185.
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i need solving this problem
The percentage statement 28 is 35% of 80 is written in the form
a/b = p/100 as 28/80 = 35/100.
Explain the term percentages?A ratio or value that can be stated as a fraction over 100 is a percentage. If we need to calculate a percentage of a number, we should divide it by its total and then multiply it by 100.The proportion usually applies to a component per hundred. Per 100 refers to what the word percent means.For the given question.
The statement defining the percentage is ;
28 is 35% of 80.
This can be written as;
35% of 80 = 28
Solve percentage.
35×80/100 = 28
35/100 = 28/80
Or,
28/80 = 35/100
This is the form
a/b = p/100
a = 28
b = 80
p = 35
Thus, the percentage statement 28 is 35% of 80 is written in the form
a/b = p/100 as 28/80 = 35/100.
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a₁ = 7
an = an-1 - 3
Write explicitly.
Answer:
a(n) = 10 -3n
Step-by-step explanation:
You want the explicit formula for the sequence recursively defined by a(1)=7, a(n)=a(n-1) -3.
Common differenceThe recursion relation tells you that each term is 3 less than the one before. That is, the common difference between terms is -3.
Explicit formulaA sequence with a common difference is an arithmetic sequence. The formula for the n-th term is ...
a(n) = a(1) +d(n -1)
where a(1) is the first term and d is the common difference.
The first term is given by the recursive definition as 7. Then the explicit formula is ...
a(n) = 7 -3(n -1)
This can be simplified to ...
a(n) = 10 -3n
pasagot po nito
(A) 4, 9, 14, 19, 24, …
Give the next two terms:
Give an expression for the nth term:
Find the 30th term:
(B) 8, 10, 12, 14, 16, …
Give the next two terms:
Give an expression for the nth term:
Find the 30th term:
(C) 1, 8, 15, 22, 29, …
Give the next two terms:
Give an expression for the nth term:
Find the 20th term:
For each of the arithmetic sequences, we have that:
a)
The next two terms are 29 and 34.The expression for the nth term is of: [tex]a_n = 4 + 5(n - 1)[/tex].The 30th term is: 149.b)
The next two terms are 18 and 20.The expression for the nth term is of: [tex]a_n = 8 + 2(n - 1)[/tex].The 30th term is: 66.c)
The next two terms are 36 and 43.The expression for the nth term is of: [tex]a_n = 1 + 7(n - 1)[/tex].The 20th term is: 134.What is an arithmetic sequence?An arithmetic sequence is a sequence of values in which the difference between consecutive terms is constant and is called common difference d.
The nth term of an arithmetic sequence is given by the following rule:
[tex]a_n = a_1 + (n - 1)d[/tex]
In which [tex]a_1[/tex] is the first term of the sequence.
For the sequences in this problem, we have that:
The first terms are, respectively, 4, 8 and 1.The common ratios are, respectively, 5, 2 and 7.Then the general rule is applied to find the nth term of the sequence, while the next two terms are found adding the common ratio.
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Can anyone write the equation of this graph?
The equation of the graph in the figure is f(x) = |x - 3| + 5
How to find the equation of the graph line?Given that the graph is an absolute value graph
We start by calculating the vertex of the graph
In this case, the graph has it minimum point located at the coordinate (3, 5)
This coordinate can then be interpreted as
(h, k) = (3, 5)
As a general rule, the general representation of the equation of an absolute value function is f(x) = |x - h| + k
Substitute the known values in the above equation
So, we have the following equation
f(x) = |x - 3| + 5
Hence, the equation of the graph is f(x) = |x - 3| + 5
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the prices of used car tires is a normally distributed variable with a mean of $50 and variance of $100. what is the probability that the price of a used car tire will be less than $65?
The probability that the price of the used car is less than $65 is 0.55962.
Here it is given that the price of the used car has a mean of $50 and a variance of $100.
Since it follows normal distribution X~N(μ, σ²)
where,
μ = 50
σ = 100
Here we need to find the probability P(X < 65)
To find this we need to convert the distribution to the standard normal form, N~(0, 1)
We know,
P(X < (x - μ)/ σ) = Φ(Z)
Therefore we get
P(X < (65 - 50)/ 100)
Solving this we get the Z value
= Φ(0.15)
From the Z table, we can get our p-value.
= 0.55962
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the sample regression line a. is estimated by the population regression line. b. maximizes the sum of the squared differences between the data points in a sample and the sample regression line. c. shows the actual (or true) relation between the dependent and independent variables. d. is used to estimate the population regression line. e. connects the data points in a sample.
The simple regression line is used to estimate the population regression line.
We are asked about, the simple regression line
We have options:
a. is estimated by the population regression line.
b. maximizes the sum of the squared differences between the data points in a sample and the sample regression line.
c. shows the actual (or true) relation between the dependent and independent variables.
d. is used to estimate the population regression line.
e. connects the data points in a sample.
From the above options, Option (d) is the correct one i.e. is used to estimate the population regression line.
The simple regression line is used to estimate the population regression line.
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solve for x
3(x-3) -5 (3x-2) [tex]\leq[/tex] 25
The solution of the given inequality is when the value of x is greater than or equal 2.
What are inequalities?Inequalities help us to compare two unequal expressions. Also, it helps us to compare the non-equal expressions so that an equation can be formed. It is mostly denoted by the symbol <, >, ≤, and ≥.
Given expression is 3(x-3) -5 (3x-2)≤ 25.
Therefore, the given inequality can be solved as,
3(x-3) - 5(3x-2) ≤ 25
3x - 9 - 15x + 10 ≤ 25
-12x + 1 ≤ 25
-12x ≤ 25 - 1
-12x ≤ 24
x ≥ 2
Hence, the solution of the given inequality is x ≥ 2.
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Which property justifies "Step 4"
Which property justifies "Step 4" in the proof below?
a. )45= m_B
b.) m B = 45
3) Substitution
4)?
The property justified by step 4 is after substitution in the equation you get the desired result.
What is an expression?Mathematical actions are called expressions if they have at least two terms that are related by an operator and include either numbers, variables, or both. Adding, subtraction, multiplying, and division are all reflection coefficient operations. A mathematical operation such as reduction, addition, multiplication, or division is used to integrate terms into an expression.
As per the data in the question,
In step 3 substitution of value is taking place.
In step 4 when values are substituted the final result is obtained, so step 4 is the result step.
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What’s the value of x?
By using the property of similar triangles, it can be obtained that
Value of x is 7.2
What are similar triangles?
Two triangles are said to be similar if the corrosponding angles are equal and the corrosponding sides are similar.
The different axioms of similarity are-
SAS axiom, AA axiom, SSS axiom
By the property of similar triangles,
[tex]\frac{9}{9 + 6} = \frac{x}{12}\\x = \frac{9}{15} \times 12\\x = 7.2[/tex]
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2 times 221 divide 4 ?
we have 5 multiple choice questions with four choices with two correct answers each. if we just randomly guess on each of the 5 questions, how many questions do you expect to choose correct answers? (no need to be integer for the number of questions)
The expectation of getting correct option out of total choice of 5 question.
What is probability?
Probability is the ratio of number of favorable outcomes to the total number of outcomes.It can not be more than 1.
According to given data:we have five question each of them has four choice, two out of them are correct.
Number of correct choice in one question = 2
Total number of choice in a question = 4
probability to get correct option of one question = 2/4 = 0.5.
Then the probability of 5 question = 5(0.5) = 2.5
Thus, the expectation of correct choice is 2.5.
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Range and domain
Help pls
The domain and the range of the function are the sets X = {- 9, - 7, - 5, - 3, - 1, 1, 3} and Y = {- 5, - 3, - 1, 1, 3, 5, 7}.
How to derive the domain and the range of a function
Herein we need to determine the domain and the range of a function, functions are relations such that every element of the domain is related only to one element of the range.
Graphically speaking, the domain of a function are represented by the set of x-coordinates and the range by a set of y-coordinates. The picture shows a discrete function, that is, a function with a finite set of points. Then, the domain and range are listed by the following sets:
Domain
X = {- 9, - 7, - 5, - 3, - 1, 1, 3}
Range
Y = {- 5, - 3, - 1, 1, 3, 5, 7}
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Please help quick this is due tomorrow and I forgot how to find x
Answer:
you have to add x outside of the parentheses
Step-by-step explanation: hope this helps
FIND THE SLOPE FROM THE TABLE
a.
b.
c.
d.
Answer:
The answer should be -5/2
Step-by-step explanation:
To find the slope take two plots from the table:
(-2,6) and (0,1)
M= y2-y1 / x2-x1
M= 1-6 / 0--2=-5/2
heidi's scores on her first 3 tests were 92, 95, and 86. what is the minimum score she mulst earn on her next test to maintain at least a 90 average
The inequality that needs to be solved is:
3t +270/ 6 ≥ 90.
let we consider that Heidi has 6 subjects in her school.
Therefore, She needs to average at least 90 on her three remaining tests to have at least a 90 overall average for all 6 tests.
Now,
To obtain an average first add up all the scores of the tests and then divide by the number of tests.
So far Heidi has taken 3 tests and we know the total number of tests will be 6 so we will be dividing by 6 to get the average of all the score.
If we let each of the three remaining tests each be represent by t, then the sum of all the tests would be:
95 + 92 + 86 + t + t + t
or
273 + 3t
The average of these 6 tests can then be represented by:
3t + 273 / 6
And for her average to be at least 90 then she can get a 90 or more which is the same as ≥ 90
So the inequality that needs to be solved is:
[tex]\frac{3t + 273}{6}[/tex] ≥ 90
or, [tex]\frac{3 ( t + 91)}{6} \geq 90[/tex]
or, [tex]\frac{t + 91}{2} \geq 90[/tex]
Now, Heidi has to score :
t/2 ≥ 91
or, t/2 ≥ 90
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2.356 in expanded form
Answer: 2 + 0.3 + 0.05 + 0.006
Step-by-step explanation: You just have to technically un add the stuff of you understand it that way.
Hope i helped you
Have a great day Darling
which of the following sampling approaches first divides the population into subgroups based on one or more variables of interest? group of answer choices simple statistical sampling systematic random sampling stratified random sampling systematic density sampling
The type of sampling is stratified random sampling
Given that,
The population is first divided into subgroups based on one or more important variables. this sampling is nothing but stratified random sampling
What Is Stratified Random Sampling?
A crucial element of the sampling method known as stratified random sampling is the division of a population into smaller subgroups known as strata. Strata are established in stratified random sampling, also known as stratification, based on the shared characteristics or attributes of the participants, such as wealth or level of education. Examining life expectancy and population demographics is just one of the many benefits and uses of stratified random sampling. Other names for stratified random sampling are proportional or quota random sampling..
Hence, this sampling is stratified random sampling
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Which of the following equations shows a directly proportionate relationship?
y = -4x
y = 3x - 1
y = 2.75x - 3
y = 7x
Answer:
first and third
Step-by-step explanation:
the equation representing direct proportion is
y = kx ← k is the constant of proportion
y = - 4x is in this form with k = - 4
y = 7x is in this form with k = 7
Write the equation for the line that passes through the point (-6, 2)
The equation of the line that passes through the points (-6 , 2) and (-4 , -1) is 3x + 2y = -14 .
In the question ,
two points are given as (-6 , 2) and (-4 , -1) .
we need to find the equation of the line passing through the given points .
to find the equation First we need to find the slope ,
slope = (-1-2)/(-4-(-6))
slope = -3/(-4 + 6)
slope = -3/2
So , the equation of the line passing through the point (-6 , 2) with slope -3/2 is
(y - 2) = (-3/2)(x - (-6))
y - 2 = (-3/2)(x + 6)
y - 2 = (-3/2)x - 9
y = (-3/2)x - 9 + 2
y = (-3/2)x - 7
2y = -3x - 14
3x + 2y = -14
Therefore , The equation of the line that passes through the points (-6 , 2) and (-4 , -1) is 3x + 2y = -14 .
The given question is incomplete , the complete question is
Write the equation for the line that passes through the point (-6, 2) and (-4,-1) , write the answer in fully reduced form .
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