A biased sample refers to a sample that is not representative of the population it is intended to represent. In a biased sample, certain characteristics or groups within the population are either overrepresented or underrepresented, leading to a distortion or skew in the data.
Bias can occur in various ways during the sampling process. Here are a few examples:
1. Selection Bias: When the method used to select the sample systematically favors or excludes certain individuals or groups from being included. This can lead to an overrepresentation or underrepresentation of specific characteristics in the sample.
2. Nonresponse Bias: When a portion of the selected sample does not participate or respond to the survey or study, resulting in a biased representation of the population.
3. Volunteer Bias: When individuals self-select to participate in a study or survey, which can introduce bias as those who volunteer may have different characteristics or motivations compared to the general population.
4. Measurement Bias: When the measurement instrument or procedure used to collect data systematically produces errors or inaccuracies that favor or exclude certain groups or characteristics.
Biased samples can lead to misleading or inaccurate conclusions about the population of interest since the sample does not accurately reflect the diversity and characteristics of the entire population. It is essential to strive for representative and unbiased samples to make valid inferences and generalizations about the population.
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A plane is flying at an altitude of 7000 feet. The angle of elevation to the plane from a truck travelling on a highway is about 68.5 degrees. How far apart are the plane and the truck?
Answer: About 2477.16 feet
Step-by-step explanation:
determine the slope given the two points. (-19,4) (17,11) PLEASE SHOW WORK
Answer:
m=7/36
Step-by-step explanation:
we need two points in order to find the ratio of the change in y and change in x, which is the slope
m=(y-y1)/(x-x1) (you can choose any point as y1 but be careful that you use the corresponding x1 value in the denominator)
m=(11-4)/(17-(-19))
m=7/36
do this and thanks for help
PLEASE ANSWER!! Write the equation of a line that passes through the points (-2,-9) and (2,-9).
Answer:
Step-by-step explanation:
the equation in the point slope form is
and reducing the equation (slope-intercept form)
Step-by-step explanation:
first we calculate the slope of the line with the formula:
where is a point where the line passes, and is another point where the line passes.
Since we have the following points:
(8, -2)
(5,5)
we conclude that
now we substitute this values to find the slope:
to find the equation now that we know the slope we use the point-slope equation:
and we subtitute the slope and the values of and :
we reduce this equation:
the equation in the point slope form is
and reducing the equation (slope-intercept form)
The areas of two squares
in the model are given.
Find the area of the
third square.
625 units2
400
units2
Answer:
225 u²
Step-by-step explanation:
The area of the larger square is 625 u². We know that area of square is the square of side. So ,
⇒ a² = 625 u²
⇒ a = √625 u²
⇒ a = 25 u .
Similarly finding the side of second square as ,
⇒ a'² = 400 u²
⇒ a' = √400 u²
⇒ a' = 20 u
If we see these are the hypontenuse and base of a right a Angled triangle formed between the square. The measure of perpendicular will be the side lenght of third square.
⇒ h² = p² + b²
⇒( 25u)² = p² + (20u)²
⇒ p² = 625 - 400 u²
⇒ p² = 225 u²
This p² is only the area of square .
Hence the area of third square is 225 u² with a side lenght of 15 u .Answer:
225 units
Step-by-step explanation:
(2 x 10^4) + (7 X 10^4) =
Answer:
90,000
Step-by-step explanation:
10^4=10,000.
2*10,000=20,000
7*10,000=70,000
20,000+70,000=90,000
Explain, using complete sentences, how you would reconcile your check register with your monthly bank statement
How do you reconcile a bank statement?
Step 1: Adjust the bank statement balance. All your transactions for the month may not be on your bank statement. ...
Step 2: Adjust the check register balance. Your bank statement may include items that you didn't record in the check register. ...
Step 3: Compare the adjusted balances.
6.
At its first stop a bus picked up 10
people. At the next stop, 8 people got
on and 3 people got off. At the third
stop, 5 people got on and 12 people
got off. How many passengers were
then on the bus?
Answer:
8
Step-by-step explanation:
10+8-3+5-12=
Ben wants to join a fitness club. The fitness club charges an initial membership fee of $49.50 and a monthly fee of 17.50. Part B ben's company will pay $300.00 each year toward his fitness club membership. Ben thinks he will have to pay $40.50 for his membership his first year. Is he correct?
Answer:
no he is not correct
Step-by-step explanation:
Please help me! I need help solving this!
Answer:
18Step-by-step explanation:
if An = n+4
then A14 = 14+4 = 18
that's all .....have fun
1. Claretta works part-time at a coffee shop. Her
weekly paychecks in March are: $87.00, $96.00,
$84.25, and $100.75. Find the median of her
paychecks.
Let's say, LM30 has entered the Barcelona camp for the last time with a backpack of W Kg before moving to PSG. After a while he needs to carry his memorable products without breaking anything by using that backpack. Now your task is to apply a suitable algorithm to help LM30 to choose his best items. In mathematical form, LM30 has a set of N items each with weight wi and value vi, for i=1 to N, choose a subset of items so that the total value carried is maximized, and the total weight carried is less than or equal to the backpack capacity, W. In that purpose, write down the last 9 digits of your mobile number, sort it in descending order. Then pick the highest value as W (digitl), consider N=4 items as follows: (Wi, vi) = (3, digit2), (1, digit3), (2, digit4), (4, digit5). Example: if the last 9 digits of your mobile number is: 684049627, then the descending order will be: 98766440. That means, the backpack capacity is W =9, and the 4 items are: (4, 8), (1, 7), (3, 6), (2,6).
The subset of items that should be carried is (2, 4) and (4, 2).
The last 9 digits of my mobile number are 904202527.
So, when I sort them in descending order, I get 975422000.
Therefore, W (backpack capacity) = 9. N = 4 items as follows: (Wi, vi) = (3, 7), (1, 5), (2, 4), (4, 2).
To find the subset of items that LM30 should choose so that the total value carried is maximized, and the total weight carried is less than or equal to the backpack capacity, we can use the 0/1 Knapsack algorithm.
Here are the steps:
Step 1: Create a table with (N+1) rows and (W+1) columns.
Step 2: Initialize the first row and first column with 0.
Step 3: For each item (i), fill the values in the table as follows:- If the weight of the item (wi) is greater than the current backpack capacity (j), copy the value from the cell above (same column).- If the weight of the item (wi) is less than or equal to the current backpack capacity (j), find the maximum value between:- The value in the cell above (same column)- The value in the cell (i-1, j-wi) + vi
Step 4: The maximum value that can be carried in the backpack is the value in the last cell (N, W).
Step 5: To find the subset of items that should be carried, start from the last cell (N, W) and trace back through the table by checking which cells contributed to this value.
For our case, the table would look like this:
Table 1The last cell (N, W) is 11, so the maximum value that can be carried in the backpack is 11.
To find the subset of items that should be carried, we can start from the last cell (N, W) and trace back through the table by checking which cells contributed to this value.
We can see that the cells (2, 6) and (4, 2) contributed to this value.
Therefore, the subset of items that should be carried is: (2, 4) and (4, 2).
Thus, LM30 should choose the items with weight 2 and 4, and values 4 and 2, respectively, to carry in his backpack so that the total value carried is maximized, and the total weight carried is less than or equal to the backpack capacity of 9.
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Which of the following identify all the names that apply to the given quadrilateral?
A Square
B Rectangle, Square
C Parallelogram, Rectangle, Square
D Parallelogram, Rhombus, Rectangle, Square
3
Find the potential function f for the field F.
F = (y - z) i + (x + 2y - z) j - (x + y) k
f(x, y, z) = xy + y2 - x - y + C
f(x, y, z) = xy + y2 - xz - yz + C
f(x, y, z) = x(y + y2) - xz - yz + C
f(x, y, z) = x + y2 - xz - yz + C
Answer is f(x, y, z) = xy + y² - xz - yz + C
Given field, F is F = (y - z) i + (x + 2y - z) j - (x + y) k
To find potential function f,
we need to find the antiderivative of each component of F, with respect to its respective variable.
The antiderivative of the x-component is
∫ (y - z) dx= xy - xz + C1
The antiderivative of the y-component is
∫ (x + 2y - z) dy= xy + y² - yz + C2
The antiderivative of the z-component is:
∫ -(x + y) dz= -xz - yz + C3
Therefore, potential function f is
f(x, y, z) = xy + y² - xz - yz + C.
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Find the limit by substitution.
lim (e^x sin x)
x→5x
The overall limit of the expression (e^x sin x) as x approaches 5x is undefined.
To find the limit of (e^x sin x) as x approaches 5x, we can substitute 5x into the expression and evaluate the result.
lim (e^x sin x) (substituting 5x for x)
x→5x
= lim (e^(5x) sin (5x))
x→5x
Now, let's analyze the behavior of the function as x approaches 5x. As x approaches 5x, the value of x becomes much larger, approaching infinity. In this case, we can examine the limits of the individual components.
1. Limit of e^(5x) as x approaches infinity:
lim e^(5x) = ∞
x→∞
Exponential functions grow exponentially as their input approaches infinity, so the limit of e^(5x) as x approaches infinity is infinity (∞).
2. Limit of sin (5x) as x approaches infinity:
lim sin (5x) = DNE
x→∞
The sine function oscillates between -1 and 1 as its input increases indefinitely. Therefore, it does not approach a specific limit as x approaches infinity.
Combining these results, we have:
lim (e^(5x) sin (5x))
x→∞
Since the limit of e^(5x) is ∞ and the limit of sin (5x) does not exist, the overall limit of the expression (e^x sin x) as x approaches 5x is undefined.
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Let f(x) = (x + 7)^2 Find a domain on which f is one-to-one and non-decreasing. Find the inverse of f restricted to this domain
The function f(x) = (x + 7)^2 is one-to-one and non-decreasing for any domain on the real numbers. The inverse of f(x) restricted to this domain is y = √x - 7.
To find a domain on which the function f(x) = (x + 7)^2 is one-to-one and non-decreasing, we need to determine where the function is strictly increasing or non-decreasing and has a one-to-one correspondence.
First, let's examine the graph of f(x) = (x + 7)^2 to understand its behavior. The function is a parabola that opens upward, centered at x = -7, and the vertex is the lowest point on the graph.
Since the vertex is the lowest point and the parabola opens upward, the function is non-decreasing for all x-values. Therefore, the function is non-decreasing over its entire domain.
To find a domain on which the function is one-to-one, we observe that the function is not symmetric about the y-axis. Hence, the domain can be any subset of the real numbers.
Now, let's find the inverse of f(x) restricted to this domain. Since f(x) is non-decreasing, the inverse will also be non-decreasing. The inverse function can be found by interchanging the roles of x and y in the original equation and solving for y.
Let's proceed with finding the inverse:
Start with the equation f(x) = (x + 7)^2.
Interchange x and y: x = (y + 7)^2.
Solve for y:
Take the square root of both sides: √x = y + 7.
Subtract 7 from both sides: y = √x - 7.
The inverse function of f(x) restricted to any domain on which it is one-to-one and non-decreasing is given by y = √x - 7.
Note that the domain can be any subset of the non-negative real numbers, since the square root function is defined only for non-negative values.
In summary, the function f(x) = (x + 7)^2 is one-to-one and non-decreasing for any domain on the real numbers. The inverse of f(x) restricted to this domain is y = √x - 7.
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HELP I WILL MARK BRAINLIEST
Answer:
the answer is A.
Step-by-step explanation:
Which relations represent functions? Choose all that apply.
{(-2, 6), (-5, -1), (3, 7), (-5, 0)}
help me please-
Answer:
its 5,1
Step-by-step explanation:
just took the test
The formula to convert Celcius to Fahrenheit is F=\frac{9}{5}C+32F=
5
9
C+32. If the temperature is -22°F−22°F what is the temperature in Celcius.
Answer:
-30C - -5.56C
Two boats start their journey from the same point A and travel along directions AC and AD, as shown below:
What is the distance, CD, between the boats?
230.9 ft
284.3 ft
115.5 ft
173.2 ft
Answer:
Option (1)
Step-by-step explanation:
By applying tangent rule in ΔABD,
tan(30°) = [tex]\frac{\text{Opposite side}}{\text{Adjacent side}}[/tex]
= [tex]\frac{AB}{BD}[/tex]
BD = [tex]\frac{AD}{\text{tan}(30)}[/tex]
BD = [tex]\frac{200}{\frac{1}{\sqrt{3} } }[/tex]
BD = 200√3 ft
By applying tangent rule in ΔABC,
tan(60°) = [tex]\frac{AB}{BC}[/tex]
[tex]\sqrt{3}=\frac{200}{BC}[/tex]
BC = [tex]\frac{200}{\sqrt{3}}[/tex]
Since, CD = BD - BC
CD = 200√3 - [tex]\frac{200}{\sqrt{3}}[/tex]
= 346.41 - 115.47
= 230.94 ft
≈ 230.9 ft
Therefore, Option (1) will be the correct option.
Answer:
230.9 ft
Step-by-step explanation:
person above said it was correct answer
What is the solution to the equation
Answer:
n=1
Step-by-step explanation:
4/5n-3/5=1/5n
4n/5-3/5=1/5n
4n/5-3/5=n/5
4n-3/5=n/5
4n-3=n
-3=n-4n
-3=-3n
1=n
n=1
Answer:
n=1
isolate the n's on one side and isolate the 3/5 to the other
4/5n-1/5n = 3/5
3/5n = 3/5
n=1
def simulate(xk, yk, models): model = linearregression() (x, y) predictions = [model.predict(xk) for model in models]
The code simulates predictions using linear regression models on input data (xk, yk) and stores the predictions in the list "predictions".
The code snippet provided performs a simulation using linear regression models on input data (xk, yk) to generate predictions. Here is a step-by-step explanation:
Initialize a list called "predictions" to store the predicted values.
Iterate over the list of models. For each model:
Use the model to predict the values of y for the given input data xk. Append the predicted values to the "predictions" list.
By using the linear regression models, the code generates predictions based on the provided input data (xk). Each model in the "models" list is applied to the input data, and the predicted values for y are stored in the "predictions" list.
It's worth noting that the code assumes the existence of a linear regression model called "linear regression()" which is used to make predictions. The input data (xk, yk) is expected to be in a format compatible with the linear regression models for accurate prediction generation.
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If f(x) = 3x^0 - 2x^-1 +4 then f(2)=
Answer:
try this link
Step-by-step explanation:
https://www3.nd.edu › WorkPDF
Web results
MATH 10550, EXAM 1 SOLUTIONS 1. If f(2) = 5, f(3) = 2, f(4) = 5, g(2 ...
The diameter of a circle is 19 meters. Complete the description for how you would find the circumference.
Answer:
The circumference of a circle is 2*pi*r or pi*diameter. The circumference is 19pi
Need Help ASAP!!! I don’t get it
Answer:
Step-by-step explanation:
134-(-80)=134+80=214
Solution(s) of the differential equation *y'= 2y
y = 2x only
А. y = 0 and Y = 22
y=0 only
y = 0 and 2x
The solutions to the differential equation y' = 2y are y = 0 and y = 2x. The solution y = 0 represents a constant function. The solution y = 2x represents a family of exponential functions.
The given differential equation is y' = 2y, where y' represents the derivative of y with respect to x. To solve this equation, we can separate variables by moving all terms involving y to one side and terms involving x to the other side:
dy/y = 2dx
Next, we integrate both sides of the equation. The integral of dy/y is ln|y|, and the integral of 2dx is 2x:
ln|y| = 2x + C
Here, C is the constant of integration. To simplify the equation, we can rewrite it as:
|y| = e^(2x + C)
Since e^(2x + C) is always positive, we can remove the absolute value sign:
y = ±e^(2x + C)
Now, let's consider the two cases separately.
Case 1: y = 0
If y = 0, then the exponential term becomes e^C, which is a constant. This implies that y remains zero for all values of x. Therefore, y = 0 is a solution to the differential equation.
Case 2: y ≠ 0
If y ≠ 0, we can rewrite the solution as:
y = ±e^C * e^(2x)
Since e^C is a constant, we can replace it with another constant, let's call it K:
y = ±K * e^(2x)
Here, ±K represents a family of exponential functions that grow or decay exponentially with a rate proportional to 2. Each value of K corresponds to a different solution to the differential equation.
In summary, the solutions to the differential equation y' = 2y are y = 0 and y = ±K * e^(2x), where K is a constant. The solution y = 0 represents a constant function, while y = ±K * e^(2x) represents a family of exponential functions.
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A heptagon has angles x, 105 degrees, 105 degrees, 160 degrees, 124 degrees, 97 degrees, 137 degrees. Find the missing angle measure in the heptagon. The sum of the interior angles of a heptagon is °. The measure of the missing angle is °.
Answer:
900 and 172 for edg 2020-2021
Step-by-step explanation:
99999 help me plz plz plz plz
Answer:
hi
Step-by-step explanation:
i think 10 in
hope it helps
Answer:
10
Step-by-step explanation:
The triangles are the same size, and if you look at the picture, you can see that MN and QR are the same, making QR 10 in.
HELP!!!!!! will give brainlist
Answer:
1. 112 cm
2 135 ft
3 53.67
Step-by-step explanation:
Answer:i
Step-by-step explanation:
A student suggests the following algorithm for calculating 72 - 38. 72 Two minus eight equals negative six. -38 -6 Seventy minus thirty equals forty. Forty plus negative six equals thirty-four, 34 which therefore is the result. As a teacher, what is your response? Does this procedure always work? Explain.
The student's suggested algorithm for subtracting numbers is incorrect. The algorithm produces the correct result in this specific case (72 - 38), but it does not work consistently for all subtraction problems.
The student's algorithm suggests subtracting the ones digit first and then subtracting the tens digit. While this approach may give the correct answer in some cases, it does not work for all subtraction problems. Subtraction is an operation where we need to consider the place value of the digits being subtracted.
In the case of 72 - 38, the student's algorithm produces the correct result of 34. However, if we apply the same procedure to a different subtraction problem, such as 43 - 29, we would get an incorrect result of 14 instead of the correct answer, 14. The student's algorithm fails to consider borrowing or regrouping when subtracting digits from different place values.
As a teacher, it is important to guide the student in understanding the standard algorithm for subtraction, which involves subtracting digits starting from the rightmost place value and borrowing when necessary. By teaching the correct procedure, students can consistently obtain accurate results for subtraction problems. It is crucial to explain the limitations of the student's suggested algorithm and emphasize the importance of understanding and applying the appropriate method for subtracting numbers.
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