The population for a clinical study has 500 Asian, 1000 Hispanic and 500 Native American people. What is good way of sampling this population to ensure that the distribution of various sub-populations is maintained if only 200 samples have to be chosen? Give the distribution of the various sub-populations in the final sample.
A good way to sample this population while maintaining the distribution of various sub-populations is by using stratified sampling. In stratified sampling, the population is divided into homogeneous subgroups or strata based on certain characteristics, and then a random sample is selected from each stratum.
To ensure that the distribution of various sub-populations is maintained, the sample should include a proportional representation of individuals from each subgroup. In this case, the subgroups are Asian, Hispanic, and Native American.
Here's how the distribution of the various sub-populations can be maintained in the final sample:
1. Determine the proportion of each subgroup in the population:
- Asian: 500 / 2000 = 0.25 (25%)
- Hispanic: 1000 / 2000 = 0.5 (50%)
- Native American: 500 / 2000 = 0.25 (25%)
2. Calculate the number of samples to be chosen from each subgroup:
- Asian: 0.25 * 200 = 50 samples
- Hispanic: 0.5 * 200 = 100 samples
- Native American: 0.25 * 200 = 50 samples
3. Randomly select the specified number of samples from each subgroup.
By using stratified sampling with the specified proportions, the final sample of 200 individuals will have a distribution that reflects the proportions of Asian, Hispanic, and Native American subpopulations in the overall population.
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Consider the case in which the proportionality constant C is equal to 1/2. Plot the graph of y=1/2x. How would you graph?
To graph the equation y = (1/2)x, we can plot points on a coordinate plane and connect them to create a straight line. Here's how to do it:
1. Choose some x-values to evaluate the equation. Let's select a range of x-values, such as -10, -5, 0, 5, and 10.
2. Substitute each x-value into the equation to find the corresponding y-values. For example:
- For x = -10, y = (1/2)(-10) = -5
- For x = -5, y = (1/2)(-5) = -2.5
- For x = 0, y = (1/2)(0) = 0
- For x = 5, y = (1/2)(5) = 2.5
- For x = 10, y = (1/2)(10) = 5
3. Plot the points (x, y) on a graph. In this case, the points would be:
(-10, -5), (-5, -2.5), (0, 0), (5, 2.5), (10, 5)
4. Connect the plotted points with a straight line. The line should pass through all the points.
The resulting graph is a straight line with a slope of 1/2, passing through the origin (0, 0), and extending infinitely in both directions.
Here is a rough sketch of the graph:
```
|
6 | .
| .
5 | .
| .
4 | .
|
3 | .
|
2 | .
|
1 | .
|
0 -----------------------
-10 -5 0 5 10
```
Note: The above graph is a visual representation and may not be to scale. The line should pass through the plotted points accurately.
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Is 2 bigger than 2.1 or 2.2?
Answer:
No.
Step-by-step explanation:
2.2 is the largest number among the others, because they all have the same number in the one's place, but the decimal is larger.
help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
8 x 12 x 20 = 1920/2 = 960 cm^2
hope this helped
answer= 960
Step-by-step explanation:
here is a pattern made from sticks
Answer:
Where I can't see the pattern made from sticks?
he average (arithmetic mean) of 100 measurements is 23, and the average of 50 additional measurements is 27 Quantity A uantity HB The average of the 150 measurements 25 Quantity A is greater Quantity B is greater
The average of the 150 measurements is 24.33, and Quantity B with a value of 25 is greater.
To compare the averages of the 150 measurements, let's calculate the total sum of all the measurements.
For the first set of 100 measurements with an average of 23, the total sum is 100 * 23 = 2300. For the second set of 50 measurements with an average of 27, the total sum is 50 * 27 = 1350.
To find the average of all 150 measurements, we need to find the total sum of all 150 measurements. Adding the two total sums calculated above, we have 2300 + 1350 = 3650.
To find the average, we divide the total sum by the total number of measurements: 3650 / 150 = 24.33.
Comparing the average of the 150 measurements to the individual averages A and B:
Quantity A: 24.33
Quantity B: 25
Since 25 is greater than 24.33, the answer is that Quantity B is greater.
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The waiting times for commuters on the Red Line during peak rush hours follow a uniform distribution between 0 minutes and 11 minutes. a) State the random variable in the context of this problem. Orv X-the waiting time for a randomly selected commuter on the Red Line during peak rush hours Orv X-a uniform distribution Orv X = waiting for a train Orv X - a randomly selected commuter on the Red Line during peak rush hours b) Compute the height of the uniform distribution Leave your answer as a fraction.
The probability density function for a uniform distribution is given by f(x) = 1/(b-a). The height of the uniform distribution is 1/11.
a) The random variable in the context of this problem is Orv X - the waiting time for a randomly selected commuter on the Red Line during peak rush hours, which follows a uniform distribution between 0 minutes and 11 minutes.
b) The height of the uniform distribution can be computed as follows:
The probability density function for a uniform distribution is given by:
f(x) = 1/(b-a)
where a and b are the lower and upper limits of the distribution, respectively.
In this case, a = 0 and b = 11, so:
f(x) = 1/(11-0) = 1/11
a) In the context of this problem, the random variable (X) represents the waiting time for a randomly selected commuter on the Red Line during peak rush hours.
b) To compute the height of the uniform distribution, you'll need to use the formula:
Height = 1 / (b - a)
where 'a' represents the minimum waiting time (0 minutes) and 'b' represents the maximum waiting time (11 minutes).
Height = 1 / (11 - 0)
Height = 1 / 11
So, the height of the uniform distribution is 1/11.
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cansomeone explain radical expressions for math plz
Answer:
A radical expression in algebra is an expression that has a radical, or root. These are inverse operations to exponents.
Step-by-step explanation: That is
Solve for k: 4k+5a−3=10−2k
Answer:
4k+5a_3=10_2k
4k+2k+5a=10+3
6k+5a=13
Can someone help find all 12 metaphors of this poem
On the fine wire of her whine she walked,
Unseen in the ominous bedroom dark.
A traitor to her camouflage, she talked
A thirsty blue streak distinct as a spark.
I was to her a fragrant lake of blood
From which she had to sip a drop or die.
A reservoir, a lavish field of food,
I lay awake, unconscious of my size.
We seem fair-matched opponents. Soft she dropped
Down like a anchor on her thread of song.
Her nose sank thankfully in; then i slapped
At the sting on my arm, cunning and strong.
A cunning, strong Gargantua. I struck
This lover pinned in the feast of my flesh,
Lulled by my blood, relaxed, half-sated, stuck
Engrossed in the gross rivers of myself.
Success! Without a cry the creature died,
Became a fleck of fluff upon the sheet.
The small welt of remorse subsides as side
By side we, murderer and murdered, sleep.
Here are 12 metaphors identified in the poem:
"On the fine wire of her whine she walked" - The wire represents a precarious situation or challenge the subject is navigating."Unseen in the ominous bedroom dark" - The darkness represents a mysterious or foreboding atmosphere.The metaphors in the poem"A traitor to her camouflage, she talked" - The subject's camouflage represents hiding or disguising one's true intentions or nature."A thirsty blue streak distinct as a spark" - The blue streak represents a rapid and intense burst of speech or expression."I was to her a fragrant lake of blood" - The fragrant lake of blood represents a source of sustenance or nourishment."From which she had to sip a drop or die" - Sipping a drop of blood represents a desperate need or dependence."A reservoir, a lavish field of food" - The reservoir and field of food represent abundance or plenty."We seem fair-matched opponents" - Being fair-matched opponents represents a balanced or equal relationship."Soft she dropped down like an anchor on her thread of song" - Dropping down like an anchor represents sinking deeply or firmly."Her nose sank thankfully in" - Sinking the nose represents a deep sense of satisfaction or contentment."I slapped at the sting on my arm" - The sting represents a physical or emotional pain."Engrossed in the gross rivers of myself" - The gross rivers represent the complex or intricate aspects of one's own existence.These are the metaphors found in the poem, providing symbolic or figurative meanings to describe the actions, emotions, or relationships portrayed.
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Um feirante vendeu duas dúzias de caixas de abacates. Em cada caixa havia meia dúzia de abacates. Quantos abacates ele vendeu? *
Answer:2
Step-by-step explanation:1+1=2
What are all the real square roots of 16?
Answer:
4.000
that's the answer I think
Factorise x^2+13x+12
Step-by-step explanation:
Given
x² + 13x + 12
= x² + ( 12 + 1) x + 12
= x² + 12x + x + 12
= x ( x + 12 ) + 1 ( x + 12)
= (x + 12) (x + 1)
Hope it will help :)❤
Write the equation for the
line that passes through
(-3, 5) and is parallel to the
graph of y = 2x - 4.
Answer:
(
y
−
4
)
=
2
⋅
(
x
+
3
)
y
−
4
=
2
x
+
6
y
=
2
x
+
6
+
4
We get the equation of the line as :
y
=
2
x
+
10
The graph will look like this:
graph{y=2x+10 [-10, 10, -5, 5]
Step-by-step explanation:
Which of the following statements justifies why the triangle shown below is not a right triangle?
Answer:
C.
Step-by-step explanation:
15^2 not = 6^2 + 11^2.
Sandeep's city took a telephone poll about a plan to build a new hotel downtown. 8,000 people took the poll. 92% of them were in favor of the new hotel. How many people were in favor of the new hotel?
Answer: 640
Step-by-step explanation:
i need help btw i am in middle school
Answer: J
Step-by-step explanation: It is very cool you are in middle schopol
Alex is going to purchase cranberry juice and lemon-lime soda for a new fruit punch recipe. The recipe calls for 3. 5 times as many bottles of lemon-lime soda as cranberry juice. If he has $16. 80 what is the most bottles of cranberry juice he can buy if cranberry juice costs $2. 80 per bottle and lemon-lime soda costs $1. 60
per bottle?
Answer:
$6
Step-by-step explanation:
To make the fruit punch, Alex needs to buy cranberry juice and lemon-lime soda. The recipe calls for 3.5 times as many bottles of lemon-lime soda as cranberry juice. If cranberry juice costs $2.80 per bottle and Alex has a budget of $16.80, he can buy a maximum of 6 bottles of cranberry juice. To find this, we first need to calculate how much Alex can spend on each type of beverage, which is $8.40. If Alex buys only lemon-lime soda, he could buy 3.5 x 6 = 21 bottles at $0.40 each. This equals $8.40, leaving no more money for cranberry juice. Therefore, he can only buy 6 bottles of cranberry juice.
The probability of success of an event is p and that of failure is q. Find the expected number of trials to get a first success.
The expected number of trials to get a first success in an event with probability of success p and probability of failure q is 1/p.
The expected number of trials to get a first success in an event with probability of success p and probability of failure q can be calculated using the formula:
Expected number of trials = 1/p
Therefore, the expected number of trials to get a first success in this event is 1/p.
For example, if the probability of success is 0.2 (or 20%), then the expected number of trials to get a first success is 1/0.2 = 5 trials.
It is important to note that this formula assumes that each trial is independent of the previous trials, meaning that the probability of success or failure does not change from one trial to the next.
In summary, the expected number of trials to get a first success in an event with probability of success p and probability of failure q is 1/p.
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find f(7) if f(x)=6x-1
Answer:
f(7) = 41
Step-by-step explanation:
6(7)-1
42-1
= 41
the diameter of a circle is 18 feet. what is the area of a sector bounded by a 100° arc? give the exact answer in sinplest form
Answer:
Step-by-step explanation:
2. (25 points) Solve (3x² + y)dx + (x²y-x) dy = 0. Do not put an absolute value in your integrating factor. (Hint: This equation is not exact)
An equation in mathematics known as a differential equation connects a function to its derivatives. It involves the derivatives of one or more unknown functions with regard to one or more independent variables.
We can use the method of precise equations to resolve the differential equation (3x2 + y)dx + (x2y - x)dy = 0 that is presented.
In order to determine whether the equation is precise, we must first determine whether (M)/(y) = (N)/(x), where M = 3x2 + y and N = x2y - x.
We have the following partial derivatives:
(M)/(y) = 1 and
(N)/(x) = 2xy - 1
The equation is not accurate because (M)/(y) does not equal (N)/(x).
We must identify an integrating factor in order to make the equation exact. We can calculate it by multiplying
(M)/(y) by (N)-(N)/(x).
Integrating factor is equal to [(M/y)]. N-(N)/(x)
= 1 / (2xy - 2xy + 1).
=1
Multiplying the entire equation by the integrating factor, we get:
(3x² + y)dx + (x²y - x)dy = 0
Since the integrating factor is 1, the equation remains unchanged.
Next, we integrate both sides of the equation with respect to x and y, treating the other variable as a constant.
Integrating the first term with respect to x, we get:
∫(3x² + y)dx = x³ + xy + C1(y)
Integrating the second term with respect to y, we get:
∫(x²y - x)dy = x²y²/2 - xy + C2(x)
Combining the two integrated terms, we have:
x³ + xy + C1(y) + x²y²/2 - xy + C2(x) = C
Simplifying, we can write the solution as:
x³ + x²y²/2 + C1(y) + C2(x) = C
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Find an orthogonal matrix A where the first row is a multiple of (3,3,0). A=
Putting it all together, we get:
A:
[-3 0 0]
[ 0 1 0]
[ 0 0 -1]
which is an orthogonal matrix with the first row being a multiple of (3, 3, 0).
An orthogonal matrix is a square matrix whose columns and rows are orthonormal vectors, i.e., each column and row has unit length and is orthogonal to the other columns and rows.
Let's start by finding a vector that is orthogonal to (3, 3, 0). We can take the cross product of (3, 3, 0) and (0, 0, 1) to get such a vector:
(3, 3, 0) x (0, 0, 1) = (3*(-1), 3*(0), 3*(0)) = (-3, 0, 0)
Note that this vector has length 3, so we can divide it by 3 to get a unit vector:
(-3/3, 0/3, 0/3) = (-1, 0, 0)
So, the first row of the orthogonal matrix A can be (-3, 0, 0) or a multiple of it. For simplicity, we'll take it to be (-3, 0, 0).
To find the remaining two rows, we need to find two more orthonormal vectors that are orthogonal to each other and to (-3, 0, 0). One way to do this is to use the Gram-Schmidt process.
Let's start with the vector (0, 1, 0). We subtract its projection onto (-3, 0, 0) to get a vector that is orthogonal to (-3, 0, 0):
v1 = (0, 1, 0) - ((0, 1, 0) dot (-3, 0, 0)) / ||(-3, 0, 0)||^2 * (-3, 0, 0)
= (0, 1, 0) - 0 / 9 * (-3, 0, 0)
= (0, 1, 0)
We can then normalize this vector to get a unit vector:
v1' = (0, 1, 0) / ||(0, 1, 0)|| = (0, 1, 0)
So, the second row of the orthogonal matrix A is (0, 1, 0).
To find the third row, we take the cross product of (-3, 0, 0) and (0, 1, 0) to get a vector that is orthogonal to both:
(-3, 0, 0) x (0, 1, 0) = (0, 0, -3)
We normalize this vector to get a unit vector:
v2' = (0, 0, -3) / ||(0, 0, -3)|| = (0, 0, -1)
So, the third row of the orthogonal matrix A is (0, 0, -1).
Putting it all together, we get:
A:
[-3 0 0]
[ 0 1 0]
[ 0 0 -1]
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FAST PLs In the rectangle below, AC = 30 units. What is DE?
D
с
E
A
B
O A. 20
O B. 30
O C. 10
O D. 15
Based on the definition of the diagonal of a rectangle, the length of DE is: D. 15.
Diagonals of a RectangleThe diagonals of a rectangle are congruent, meaning they have equal length measure.The diagonals also bisect each other, dividing each into equal segments.Thus:
AC = 30 units.
AC = DB
DB = 30 units
Therefore:
DE = 1/2(DB)
DE = 1/2(30)
DE = 15 units
Therefore, based on the definition of the diagonal of a rectangle, the length of DE is: D. 15.
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Eight rational numbers are plotted on a number line.
A number line with Point A labeled at negative three halves. Point B is labeled at negative four thirds. Point C is labeled at negative three fourths. Point D is labeled at negative two thirds. Point E is labeled at two thirds. Point F is labeled at three fourths. Point G is labeled at four thirds. Point H is labeled at three halves.
Which of the following is true about opposite numbers?
Point D and Point A are opposite rational numbers because they are the reciprocal of each other.
Point D and Point E are opposite rational numbers because they are the same distance away from zero.
Point D and Point H are opposite rational numbers because they are the opposite reciprocals of each other.
Point D and Point F are opposite rational numbers because Point F is farther away from zero than Point D.
The correct option regarding opposite rational numbers is given as follows:
Point D and Point E are opposite rational numbers because they are the same distance away from zero.
What are opposite rational numbers?Rational numbers are all the numbers that can be represented by fractions. The opposite of a rational number is the number with the exchanged signal, for example, -2 is the opposite of 2 and vice-versa.
For this problem, we have that:
D = -2/3.E = 2/3.Same absolute value(distance from 0), different signals, hence the correct option is given by:
Point D and Point E are opposite rational numbers because they are the same distance away from zero.
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A motor racing circuit has length 5 5/6 miles.A straight section of the circuit has length 1 1/4 miles.What fraction of the circuit is the straightest section
Answer:
Dear user,
Answer to your query is provided below
The fraction of the circuit is (3/14)
Step-by-step explanation:
Explanation of the same is attached in image
Answer:
3/14
Step-by-step explanation:
Chico by 75 shares of stock at $19.58 per share he receives dividends of $73.42 during the year at the end of the year his stock is valued at $22.14 what was his value at the end of the year
Answer: 192
Step-by-step explanation:
(22.14-19.58)x75
HELP ME BEFORE 5PM. ( it’s 4:05 now)
We Do It - Solve 4 + 7sr = -1
Enter the missing values to solve the equation.
Write the equation
Subtraction property of equality
Simplify
Multiplication property of equality
Simplify again
Answer:
use math-way
Step-by-step explanation:
Help me answer this please quickly!
Answer:
Step-by-step explanation:
When two lines intersect, the non adjacent angles formed are called vertical angles and they are congruent.
∠FZG = ∠HZJ {Vertical angles are congruent.
∠FZG = 38°
PLEASE HELP IF YOU CAN
Answer:
b or the second option
Step-by-step explanation:
it is congruent because two sides are the same.
hope this helps! have a good day and stay safe!
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