Question 2 suppose we wanted to compare the rates of return for two stocks: the technology company intel and the u.s. airline southwest airlines. to compare the rates of return, we take a random sample of 50 days of intel's stock returns and another random sample of 50 days for southwest's stock returns (not necessarily the same days). these data should not be treated as paired. why would these data not be considered paired data
Answers
Paired data refers to observations that are matched or connected in some way. In this case, if we were comparing the rates of return for the two stocks on the same set of 50 days, then it would be considered paired data.
The data comparing the rates of return for the technology company Intel and the U.S. airline Southwest Airlines would not be considered paired data because the samples are not taken on the same days. Paired data refers to observations that are matched or connected in some way. In this case, if we were comparing the rates of return for the two stocks on the same set of 50 days, then it would be considered paired data.
However, in this scenario, two separate random samples of 50 days of stock returns are taken for each company. The days on which the stock returns are recorded are not necessarily the same for both Intel and Southwest Airlines. Therefore, there is no direct pairing or connection between the observations of the two stocks.
To illustrate this further, let's say we take a random sample of 50 days for Intel's stock returns, and another random sample of 50 days for Southwest's stock returns. The first day in the Intel sample may not correspond to the first day in the Southwest sample, and so on. Each sample represents independent observations for each stock, making the data unpaired.
It is important to recognize whether data is paired or unpaired as it can affect the statistical methods used for analysis. In this case, since the data is not paired, we would use different approaches to compare the rates of return for Intel and Southwest Airlines.
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Related Questions
suppose that only 40% of all drivers come to a complete stop at an intersectionhaving flashing red lights in all directions. randomly observe 8 drivers at the the probability that exactly five of them will come to a complete stop. g
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The probability of exactly five out of eight observed drivers coming to a complete stop is approximately 0.278.
To calculate the probability that exactly five out of eight randomly observed drivers will come to a complete stop at an intersection with flashing red lights, we can use the binomial probability formula.
Probability of success (p) = 0.40 (drivers coming to a complete stop)
Number of trials (n) = 8 (observed drivers)
Number of successes (k) = 5 (drivers coming to a complete stop)
The binomial probability formula is : P(X = k) = nCk * p^k * (1 - p)^(n - k)
By using this formula, we can calculate the probability of achieving a specific number of successes in a given number of trials or observations, assuming the trials are independent and the probability of success remains constant for each trial.
nCk represents the number of combinations of n items taken k at a time.
Plugging in the values:
P(X = 5) = 8C5 * 0.40^5 * (1 - 0.40)^(8 - 5)
By evaluating this expression, we find that the probability of exactly five out of eight observed drivers coming to a complete stop is approximately 0.278.
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Which graph is that of the inequality shown below
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Answer:
The correct graph is graph B.
to properly measure the volume of water in a calibrated glass device, such as a graduated cylinder, one should________
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The lowest point should be used for measurement. To acquire a correct reading, students must read the meniscus at eye level. In order to read the meniscus at eye level, students need first set the graduated cylinder on the table and then stoop.
A measuring cylinder, often referred to as a graded cylinder, a cylinder measuring cylinder, or a mixing cylinder, is a piece of lab apparatus used to gauge the quantity of fluids, chemicals, or solutions used during a typical lab session. Compared to common laboratory flasks and beakers, graduated cylinders offer higher precision and accuracy. The graduated cylinder is a scientific tool that employs the metric system rather than the American standard system, so measurements are made in millilitres rather than ounces. The volume of an object or quantity of liquid is measured using a graduated cylinder, a common piece of laboratory glassware. It is a glass cylinder with side markings resembling those on a measuring cup, as its name suggests.
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can somebody please answer this asap
Answers
Answer:
you have to add all of them up it will get you some of your awner
Multiplying 2×1 3/7 is equal to how much
Answers
Answer:
20/7 or 2 and 6/7
Step-by-step explanation:
This equation works out to 2/1 • 10/7, which we can easily see equals 20/7, or 2 and 6/7, by multiplying the numerators and denominators.
please help will give brainliest
Answers
The correct explicit rule is f(n) = 50 + 30n
What is Explicit Rule?An explicit rule is a mathematical formula that directly gives the n-th term of a sequence or the value of a function for a given input, without the need to find other terms first. It can be expressed using variables, constants, and operations such as addition, subtraction, multiplication, and division.
To determine who is correct, we need to first understand the meaning of the variables in the explicit rules.
Let n be the number of days the car is rented for.
Let f(n) be the cost of renting the car for n days.
The deposit is a one-time charge and is not dependent on the number of days rented. Therefore, the constant term in the explicit rule should be 50.
Now, for each day rented, the cost is $30. This means that the cost for n days should be 30n.
So the correct explicit rule is:
f(n) = 50 + 30n
Therefore, Kevin is correct with the explicit rule f(n) = 50 + 30(n-1). This is because we subtract 1 from n since the deposit is charged only once at the beginning and is not included in the daily rate.
Suzanne's explicit rule, f(n) = 80 + 30(n-1), adds an extra $30 to the cost of renting the car, which is not correct.
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Consider the two functions below. Which one of these functions is linear? What is its equation? Enter any answers to two decimal places
Answers
Answer:
A
Step-by-step explanation:
A linear function is a straight line when graphed so is not B.
For confirmation of A note how for each increase of 3 in x we get the same increase of 5 in y.
Iris's checking account pays simple interest at 4% per year. She has $180 in her account. Write a linear function to model the amount of money in her checking account at any time t.
A(t)=
Answers
The amount of money in Iris's checking account can be modeled by a linear function of the form:
y = mt + b
where y is the amount of money in the account, t is the time (measured in years), m is the rate of interest, and b is the initial amount in the account.
In this case, we have m = 0.04 (since the interest rate is 4% per year) and b = 180 (since that's the initial amount in the account). Therefore, the linear function that models the amount of money in Iris's checking account at any time t is:
y = 0.04t + 180
For example, if t = 5 (years), then the amount of money in Iris's checking account is 0.04 * 5 + 180 = 198 dollars.
b.The branch manager wants to improve the service and suggests dispatching buses every 0.5 minute. She argues that this will reduce the average traveling time (a round trip) to 3.5 minutes. Is she correct? (Enter "Yes" or "No" in the following blank). c. Following the branch manager's suggestion (dispatch busses every 0.5 min), what will the average traveling time be? average travelling time____ (mins) (enter the numbers only)
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(b) No, The branch manager's argument that dispatching buses every 0.5 minutes will reduce the average traveling time (a round trip) to 3.5 minutes is not correct.
To calculate the average time, we need to consider the time it takes for the bus to travel to the airport and back, as well as the time spent waiting for the bus.
If buses are dispatched every 3 minutes, and the average traveling time (a round trip) is 21 minutes, it means that passengers spend 18 minutes waiting for the bus (21 minutes - 3 minutes of traveling time).
If buses are dispatched every 0.5 minutes, the waiting time will be significantly reduced. However, the traveling time remains the same at 21 minutes for a round trip.
Therefore, the average traveling time will not be reduced to 3.5 minutes but will remain at 21 minutes (assuming the traveling time remains constant).
(c) The average traveling time, following the branch manager's suggestion of dispatching buses every 0.5 minutes, would still be 21 minutes.
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Complete question:
The Avis Company is a car rental company and is located three miles from the Los Angeles airport (LAX). Avis is dispatching a bus from its offices to the airport every 3 minutes. The average traveling time (a round trip) is 21 minutes.
(a) The branch manager wants to improve the service and suggests dispatching buses every 0.5 minute. She argues that this will reduce the average traveling time (a round trip) to 3.5 minutes. Is she correct? (Enter "Yes" or "No" in the following blank).
c. Following the branch manager's suggestion (dispatch busses every 0.5 min), what will the average traveling time be? average travelling time ____(mins) (enter the numbers only)
2 2.1 Mathematical intro show that there is another form for spherical harmonics: 1 3 3 Y₁ x iy 1/√√2 (²-1) 2πT 2π 1 3 3 z YO 2 2π π r 1 3 x iy Y₁¹ 3 2π - - 12 √ √ 2² (²+²) 2 2π
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Spherical harmonics are an integral part of quantum mechanics. They describe the shape of the orbitals, which electrons occupy in atoms. Moreover, the spherical harmonics provide the angular distribution of a wave in spherical coordinates. In 3D, the spherical harmonics can be written as:
Ylm(θ, φ) = √(2l + 1)/(4π) * √[(l - m)!/(l + m)!] * Plm(cosθ) * e^(imφ)
Here, l and m are known as the angular quantum numbers. They define the shape and orientation of the orbital. Plm(cosθ) represents the associated Legendre polynomial, and e^(imφ) is the exponential function. The spherical harmonics have various forms, including:
Y1,1 = -Y1,-1 = 1/2 √(3/2π) sinθe^(iφ)
Y1,0 = 1/2 √(3/π)cosθ
Y2,2 = 1/4 √(15/2π)sin²θe^(2iφ)
Y2,1 = -Y2,-1 = 1/2 √(15/2π)sinθcosφ
Y2,0 = 1/4 √(5/π)(3cos²θ-1)
Y0,0 = 1/√(4π)
The spherical harmonics have various applications in physics, including quantum mechanics, electrodynamics, and acoustics. They play a crucial role in understanding the symmetry of various systems. Hence, the spherical harmonics are an essential mathematical tool in modern physics. Thus, this is how one can show another form for spherical harmonics.
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Enter the value of n so the expression (7y + 6) + (3y – 2) is equivalent to (ny + 4),
Answers
Answer:
10
Step-by-step explanation:
45% of what number is 7.2
Answers
Hello!
45% of x = 7.2
45x/100 = 7.2
45x = 7.2 * 100
45x = 720
x = 720/45
x = 16
the number = 16
I’m not sure I need help
Answers
Answer:
D) \(1 < x\leq 4\)
Step-by-step explanation:
1 is not included, but 4 is included, so we can say \(1 < x\leq 4\)
Plzzzz help worth 30 points plzzzz help
Answers
Answer:
$0.70
Step-by-step explanation:
For an alternative hypothesis: µ > 6,700, where is the rejection region for the hypothesis test located? In both tails In the left or lower tail In the right or upper tail In the center
Answers
The rejection region for the alternative hypothesis µ > 6,700 is located in the right or upper tail.
In hypothesis testing, the rejection region is the range of sample values that leads to the rejection of the null hypothesis. The alternative hypothesis in this case states that the population mean (µ) is greater than 6,700. To determine the rejection region, we need to consider the critical value or significance level (α) chosen for the test.
The rejection region for the alternative hypothesis µ > 6,700 is located in the right or upper tail of the distribution. This means that if the sample mean falls in this region, it provides strong evidence against the null hypothesis. The specific values that define the rejection region depend on the chosen significance level. Typically, the rejection region is determined by comparing the test statistic (such as a t-value or z-value) to the critical value obtained from a statistical table or calculator. If the test statistic falls in the rejection region, the null hypothesis is rejected in favor of the alternative hypothesis, indicating evidence for a population mean greater than 6,700.
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× + 2 + 2x + 3 = 4x PLS HELP ME
Answers
Answer: 8
Step-by-step explanation:
Answer:
I dont know what your supposed to do but i can tell you that x = 5 because if you simplify the equation you get 3x + 5 = 4x. Using this you can infer that a single x is equivalent to 5 since you need 5 to get from 3x to 4x.
Can someone please help with this.
Answers
Answer:
92
Step-by-step explanation:
Sum of 2 interior angles= exterior angle so
148=56+h
h= 148-56
Solve the following the inequality: 12 < 4x - 16 < 16
Answers
Answer:
7 < x < 8
Step-by-step explanation:
\(12<4x-16<16\\\\12+16<4x-16+16<16+16\\\\28<4x<32\\\\\frac{28}{4}<\frac{4x}{4}<\frac{32}{4}\\\\7<x<8\)
Given the points (7,3) and (k,−7), for which values of k would the distance between the points be 2√ 41 ?A. 17 or -4B. 17 or 2C. 15 or -1D. 14 or -4
Answers
For this problem, we use the formula for the distance between two points:
\(d((x_1,y_1),(x_2,y_2))=\sqrt[]{(x_1-x_2)^2+(y_1-y_2)^2}\)Substituting the given points, setting the distance equal to 2√41, and solving for k we get:
\(\begin{gathered} 2\sqrt[]{41}=\sqrt[]{(k-7)^2+(-7-3)^2}=\sqrt[]{k^2-14k+49+100} \\ 2\sqrt[]{41}=\sqrt[]{k^2-14k+149} \\ k^2-14k+149=4\cdot41=164 \\ k^2-14k+49=64 \\ (k-7)^2=8^2 \\ k-7=8\text{ or k-7=-8} \\ k=15\text{ or k=-1} \end{gathered}\)The figure below is dilated by a factor of 2/3 centered at the origin. Plot the resulting image.
Answers
To plot the resulting image, you will need to take the original figure and multiply each coordinate by the factor of 3/2. For example, if the original figure had a point at (3,4), the new image will have the point at (4.5,6). This will be true for all points in the original figure.
What is coordinate?Coordinate is a point or set of values that is used to determine the position of a point, object, or shape in a two-dimensional or three-dimensional space. Coordinate values usually consist of two or three numbers that represent the distance of the point from the origin (x, y, and/or z).
The answer to this question is to plot the resulting image of a figure that has been dilated by a factor of 2/3. A dilation is a transformation that changes the size of a figure. It can either make the figure larger, or smaller. In this case, the dilation is making the figure smaller by a factor of 2/3.
When a figure is dilated, the origin (the point (0,0)) is the center of the transformation. This means that the figure is scaled down from the center point. In general, a dilation by a factor of k will scale down the figure by a factor of 1/k. In this case, the dilation is by a factor of 2/3 so the figure will be scaled down by a factor of 3/2.
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Find the length of the rectangle if x= 10.
And find the perimeter if x=10
PLEASE HELP .
Answers
Answer:
34
Step-by-step explanation:
10+2=12
12 on both sides=24
5 on both sides=10
10+24=34
The perimeter of the rectangle is 34 for the given sides.
What is the perimeter of the rectangle?The rectangle is defined as a quadrilateral having four sides and the angle suspended by all the sides is equal to 360 degrees. The perimeter is the sum of all the sides of the rectangle.
Given that the two sides of the rectangle are 5 and x + 2. The value of x is 10.
The perimeter of the rectangle will be calculated as:-
L = 10+2=12
12 on both sides=24
5 on both sides=10
Perimeter = 10+24=34
Therefore, the perimeter of the rectangle is 34 for the given sides.
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Antonio is 12 years older than Nick today. In five years, Antonio will be twice as old as Nick. How old is Nick today
Answers
Answer:
8.5? sorry but it's division so uhm sorry if I'm wrong my division is garbage.
Source:trust me bro
A. Use models to illustrate the given proportion. Do it on your answer sheet. 1) 8:6 = 4:3 2) 15:3 = 5:1 3) 12:6 = 4:2 4) 11: 7 and 44:27 5) 25 eggs to 3 hens and 75 eggs to 9 hens
pls answer it correctly
Answers
Using models to to illustrate the proportions is similar to reducing or increasing a ratio by a common factor. The solutions to the exercise are given below :
1.)
8 : 6
Reducing each side of the ratio by an half(1/2) :
8 × ½ : 6 × ½
4 : 3
2.)
15 : 3
Reducing each side of the ratio by ⅓:
15 × ⅓ : 3 × ⅓
5 : 1
3.)
12 : 6
Reducing each side of the ratio by (one-third) ⅓:
12 × ⅓ : 6 × ⅓
4 : 2
4.)
11 : 7
Increasing the proportion by 4 :
11 × 4 : 7 × 4
44 : 28
5.)
25 eggs : 3 hens
Increasing the number of hens by 3, then egg production will also triple
25 eggs × 3 : 3 hens × 3
75 eggs to 9 hens
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Which expression is equivalent to 1/4 (4+9)? plssss help me I only have 20 minutes
Answers
Answer:
it is 3.2.5
Step-by-step explanation:
yw
Me ayudan porfavor 2 trinomios cuya diferencia sea 4x²-7x+5
Answers
Answer:
Δ = b² - 4ac
Step-by-step explanation:
do math
Last year's litter consisted of 12 kittens, and this year's litter is 3/4 as large. If 2/3 of this new litter's cats are brown, how many cats are not brown?
Answers
Answer:
3 cats are not brown
Step-by-step explanation:
3/4 of 12 is 9 so there are 9 kittens in the litter
2/3 of 9 = 6, meaning that 6 cats are brown
9-6 = 3
3 cats in the new litter are not brown
one reason for using a t distribution instead of the standard normal curve to find critical values when calculating a level c confidence interval for a popu- lation mean is that (a) z can be used only for large samples. (b) z requires that you know the population standard deviation s. (c) z requires that you can regard your data as an srs from the population. (d) z requires that the sample size is at most 10% of the population size. (e) a z critical value will lead to
Answers
One reason for using a t distribution instead of the standard normal curve to find critical values when calculating a level c confidence interval for a population mean is that (b) z requires that you know the population standard deviation s.
The t distribution is used when the population standard deviation is unknown and is estimated from the sample. The t distribution has fatter tails than the standard normal curve, which makes it more appropriate for smaller sample sizes. When the sample size is large, the t distribution approaches the standard normal curve, and the z distribution can be used instead.
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22x+100=25x+70
Find the X
Answers
Answer:
X=10
Step-by-step explanation:
Step 1: Subtract 100 from both sides of the equation.
Step 2: Simplify.
Step 3: Subtract 25x from both sides of the equation.
Step 4: Simplify.
Step 5: Divide both sides of the equation by the same term.
Step 6: Simplify.
X=10 :)
Answer:
x = 10Step-by-step explanation:
In this question we are given an equation that is 22x + 100 = 25x + 70. And we are asked to find the value of x .
Solution : -
\( \longmapsto \:22x + 100 = 25x + 70 \)
Step 1 : Subtracting 100 from both sides :
\( \longmapsto \:22x + \cancel{100} - \cancel{100} = 25x + 70 - 100\)
On further calculations we get :
\( \longmapsto \: 22x = 25x - 30\)
Step 2 : Subtracting 25x from both sides :
\( \longmapsto \:22x - 25x = \cancel{ 25x} - \cancel{25x }- 30\)
On further calculations we get :
\( \longmapsto \: \cancel{- }3x = \cancel{ - }30\)
Step 3 : Dividing with 3 on both sides :
\( \longmapsto \: \frac{ \cancel{3}x}{ \cancel{3}} = \cancel{\frac{30}{3} }\)
On further calculations we get :
\( \longmapsto \: \purple{\boxed{ \frak{x = 10}}}\)
Henceforth , value of x is 10 .Verifying : -
We're verifying our answer by substituting value of x in given equation . So ,
22x + 100 = 25x + 7022 ( 10 ) + 100 = 25 ( 10 ) + 70220 + 100 = 250 + 70320 = 320L.H.S = R.H.S Hence, Verified.Therefore, our value for x is correct .
#Keep LearningThe mean for the data set is 2. 5.
What is the mean absolute deviation (MAD)? Round to the nearest tenths
Answers
Given:
The mean of the data set is 2.5.
We are asked to calculate the mean absolute deviation (MAD) of the data set.
Formula for MAD:
MAD = ∑ | xi - μ | / n
Where:
μ = Mean of the data set
xi = Data points
n = Number of data points
Calculation for MAD:
Data set: 1, 2, 3, 4, 5
Step 1: Find the deviations of each data point from the mean.
Data point Deviation from mean
1 -1.5
2 -0.5
3 -0.5
4 -1.5
5 -2.5
Step 2: Find the total deviation (absolute value).
Total deviation (absolute value): 1.5 + 0.5 + 0.5 + 1.5 + 2.5 = 6
Step 3: Calculate the mean absolute deviation (MAD).
MAD = Total deviation / Number of data points = 6 / 5 = 1.2
Rounded to the nearest tenth:
MAD ≈ 1.2
Therefore, the mean absolute deviation (MAD) of the given data set is 1.2 (rounded to the nearest tenth).
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About 11% of the general population is left handed. At a school with an average class size of 30, each classroom contains four left-handed desks. Does this seem adequate? My teacher told me the answer is 77.05% but, I do not know how to get that answer.
Answers
The percentage of left and right handed students in the sample are 13.33 and 86.68% respectively.
Percentage of left-handed population= 11%
Class size = 30
Number of left-handed students per class = 4
The percentage of left-handed students can be calculated thus :
(number of left-handed students/ Number of students per class) * 100%percentage= (4/30) × 100% = 13.33%
Therefore, the percentage of left-handed students per class is 13.33%
Percentage of right-handed students = (100-13.33)% = 86.68%
Therefore, percentage of left-handed and right-handed students are 13.33 and 87.68% respectively.
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