We require a more accurate and objective measure to determine the association between the two variables because visual exams are primarily subjective. We employ the linear correlation coefficient to express the degree and direction of the association between two variables:
\(r=\frac{\sum \frac{\left(x_i-\bar{x}\right)}{s_x} \frac{\left(y_i-\bar{y}\right)}{s_y}}{n-1}\)
where the sample means and standard deviations of the x's are x and sx, respectively, and the y's are y and sy, respectively. n is the sample size. .
A different method of calculating the correlation coefficient is:
\(r=\frac{S_{x y}}{\sqrt{S_{x x} S_{y y}}}\)
\(\begin{aligned}& \text { where } S_{x x}=\sum x^2-\frac{\left(\sum x\right)^2}{n} \\& S_{x y}=\sum x y-\frac{\left(\sum x\right)\left(\sum y\right)}{n} \\& S_{y y}=\sum y^2-\frac{\left(\sum y\right)^2}{n}\end{aligned}\)
In honor of Karl Pearson, who created the linear correlation coefficient in the first place, it is also known as Pearson's product moment correlation coefficient. This metric quantifies the strength of the linear, or straight-line, relationship between the two variables as well as its positive or negative direction.
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please!!!
need an answer asap!
will give brainliest
Sally has seen four movies. The ticket prices were: $13, $8, $10, $10 The next movie she plans to see in is 3D and the ticket price is $34. Circle one of the following that will not change after Sally sees the next movie
The prices of the four movies that Sally has already seen will not change after she sees the next movie.
The ticket prices of the four movies that Sally has already seen are fixed and do not depend on whether she sees another movie or not. Therefore, these prices will remain the same even after she sees the next movie. The price of the next movie that Sally plans to see is $34, which is independent of the ticket prices of the previous movies.
Thus, the cost of the previous movies that Sally has seen will not change after she sees the next movie. In other words, the previous expenses are sunk costs and are irrelevant to future decisions.
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Felix and Megan are going hiking and are trying to figure out how much water
they should bring with them on the hike.
t = the length of the hike
w = the amount of water they should bring on the hike
Which of the variables is dependent?
Answer:
w
Step-by-step explanation:
The amount of water they need to bring depends on how long they will be hiking.
Anybody want to help with math?
10 + 23 / (4 + 1 + 10) - 200 + 365
Ty :)
Answer:
176.53
Step-by-step explanation:
All i didnwas just solve the math on paper and u could use a caculator
Answer:
33/-550
Step-by-step explanation:
Add
Hope it help
Find the rule of a quadratic function whose graph has the given vertex and passes through the given point. vertex (2,3) , point (5,39) f(x)=
The rule of the quadratic function is f(x) = 4x² - 8x + 7, where the vertex is (2,3) and the point (5,39) lies on the graph.
To determine the rule of the quadratic function, we need to consider the general form of a quadratic function, which is f(x) = ax² + bx + c, where a, b, and c are constants.
Given that the vertex of the quadratic function is (2,3), we know that the x-coordinate of the vertex is 2. This corresponds to the formula x = -b/2a. By substituting the x-coordinate (2) into the formula, we can solve for b.
2 = -b/(2a)
Cross-multiplying gives -4a = b.
Now, we have the value of b. Next, we substitute the vertex coordinates (2,3) into the quadratic function to solve for a and c.
f(2) = 4(2)² - 8(2) + c
3 = 16 - 16 + c
3 = c
Hence, we have found the values of b and c. Plugging them into the quadratic function, we get f(x) = 4x² - 8x + 7, which is the rule of the quadratic function that satisfies the given conditions.
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Diameter ROQ of circle O is extended through Q to point P, and
tangent PA is drawn. If m RA = 100°, what is m/P?
(1) 10°
(2) 20°
(3) 40°
(4) 50°
The measure of angle P on the circle with the tangent in this problem is given by the following option:
(4) 50°.
How to obtain the measure of angle P?In this problem, what we have is the intersection of a tangent and a chord, hence the measure of the angle formed by the chord and the tangent is half the measure of the intercepted arc.
From the diagram given by the image shown at the end of the answer, we have that the length of the intercepted arc is given as follows:
m < RA = 100º.
Then the measure of angle P is of half the length of the intercepted arc, which is given as follows:
m < P = 0.5 x m < RA = 0.5 x 100º = 50º.
Which means that option 4 is the correct option for the measure of angle P.
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c) How many fifths are there in 20?
Answer:
they are 4 i think
Step-by-step explanation:
5 x 4 = 20
Answer:
100
Step-by-step explanation:
20 divided by 1/5 = 20 x 5/1 = 100
2/5+m=5/6 step by step explanation
Answer:
13/30
Step-by-step explanation:
Begin by getting 2/5 on the right side.
2/5-2/5 + m = 5/6 - 2/5
The lowest common denominator is 6 * 5 which are prime to each other.
m = 5/6 - 2/5 Multiply the tops and bottoms to make the bottoms 30
m = 5*5/(6*5) - (2*6)/(5*6)
m = (25 - 12)/30
m = 13/30
Someone please help me I really forgot how to do this!
y = mx + b
m = slope or rate of change
b = y-intercept
x = input
y = output
Answer:
x= input
y= output
Step-by-step explanation:
Solve for :
- 2x + 19 = 3x - 1
-
STEP 1: Add/Subtract one of the X-terms from both sides and re-write the new equation:
Answer:
x=4
Step-by-step explanation:
-2x+19=3x-1
+2x +2x
19=5x-1
+1 +1
20=5x
/5 /5
4=x
x=4
If you receive 25% off an item costing $220, how much
money do you save?
Answer:
You save $55
Step-by-step explanation:
To find out what the 75% of the 220 is, you need to do .75 times 220 and then after you get the answer, subtract that number from 220 and you have your answer.
If £31 = 500 rubles how many £ are in 992 rubles ? Give answer to 2 dp
Answer:
61.504
Step-by-step explanation:
Answer:
There are £61.50 in 992
Step-by-step explanation:
Here, we shall be doing some currency conversions.Now, £31 = 500 rublesThen;£x = 992 rubles To get c, what we do is simply cross multiply £x * 500 rubles = £31 * 992 rubles £x = (£31 * 992 rubles)/500 rubles £x = £61.504which is £61.50 to two decimal places
hope this helps!!
find the value of each trigonometric ratio
The trigonometric relations from the triangles are
a) tan A = 5/12
b) sin C = 3/5
c) cos X = 3/5
d) sin Z = 4/5
e) tan Z = 4/3
f) tan X = 12/5
What are trigonometric relations?
Trigonometry is the study of the relationships between the angles and the lengths of the sides of triangles
The six trigonometric functions are sin , cos , tan , cosec , sec and cot
Let the angle be θ , such that
sin θ = opposite / hypotenuse
cos θ = adjacent / hypotenuse
tan θ = opposite / adjacent
tan θ = sin θ / cos θ
cosec θ = 1/sin θ
sec θ = 1/cos θ
cot θ = 1/tan θ
Given data ,
a)
The triangle is ΔABC
tan A = opposite side / adjacent side
Substituting the values in the equation , we get
tan A = 10/24
tan A = 5/12
b)
The triangle is ΔABC
sin C = opposite side / hypotenuse
Substituting the values in the equation , we get
sin C = 24/40
sin C = 3/5
c)
The triangle is ΔXYZ
cos X = adjacent side / hypotenuse
Substituting the values in the equation , we get
cos X =21/35
cos X = 3/5
d)
The triangle is ΔXYZ
sin Z = opposite side / hypotenuse
Substituting the values in the equation , we get
sin Z = 32/40
sin Z = 4/5
e)
The triangle is ΔXYZ
tan Z = opposite side / adjacent side
Substituting the values in the equation , we get
tan Z = 28/21
tan Z = 4/3
f)
The triangle is ΔXYZ
tan X = opposite side / adjacent side
Substituting the values in the equation , we get
tan X = 12/5
Hence , the trigonometric relations are solved from the triangles
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Parralel lines cut by a transversal coloring activity. Please give explanation. Will give brainiest.
Step-by-step explanation:
Parallel lines cut by a transversal coloring activity is an activity that helps students understand the pattern of angles when parallel lines are cut by a transversal. The activity involves coloring the angles formed by the parallel lines and the transversal in different colors. This helps students identify the different types of angles formed and their relationships with each other.
4 plus 4 minus 4 times 4 divided by 4? Are you smart enough to figure this out
Answer:
4
Step-by-step explanation:
use pemdas.
4+4-4x4/4
4+4-16/4
4+4-4
8-4
4
Please help!how do you say that the rate of cost of rice and quantity of rice are inverse proportion? write with an example
Answer:
Yes, the rate of cost of rice and total cost of rice are in direct proportion
Step-by-step explanation:
If we increase the rate of cost of rice the total cost of rice also increases. Hence, we can say that the rate of cost of rice and total cost of rice are in direct proportion.
Please mark me as the brainliest !!!
Find the 52nd term of the arithmetic sequence —24, –7, 10, ...
Answer:
843Step-by-step explanation:
\(a = -24\\d = t2 -t1\\d = -7-(-24)\\d = -7+24\\d = 17\\\\T_{n} = a +(n-1)d\\T_{52} = -24+(52-1)17\\T_{52} = -24+(51)17\\T_{52} = -24+867\\T_{52} = 843\)
I hope i am correct
Answer:
843
Step-by-step explanation:
Here,
First term a = - 24
Common difference (d) = - 7 - (-24) = - 7 + 24 = 17
Nth term of an Arithmetic sequence is given as:
\(a_n = a + (n-1)d \\ a_{52} = - 24 + (52-1) \times 17 \\ a_{52} = - 24 + 51 \times 17 \\ a_{52} = - 24 + 51 \times 17 \\ a_{52} = - 24 + 867\\ a_{52} = - 24 + 867 \\ \\ \huge \red { \boxed{ a_{52} = 843}}\)
One of the video editors in your company is worried that he may lose a lot of data if his hard drive fails. He has asked you to come up with a solution. To do this, you have decided to implement a RAID 10 solution on his desktop workstation.Which of the following is the MINIMUM number of hard disks that can be used?a. 6b. 5c. 4d. 3e. 2
The minimum number of hard disks that can be used for implementing a RAID 10 solution is four (option c).
The minimum number of hard disks that can be used for implementing a RAID 10 solution on the video editor's desktop workstation is four (option c). RAID 10, also known as RAID 1+0, combines elements of RAID 1 (mirroring) and RAID 0 (striping) to provide both data redundancy and improved performance.
In RAID 10, data is mirrored across multiple drives to ensure redundancy. To implement RAID 10, we need at least two sets of mirrored drives, where each set contains a minimum of two hard disks.
The data is striped across these mirrored sets to enhance performance.
With four hard disks, you can create two mirrored sets, each consisting of two drives.
The data is then striped across these mirrored sets, providing both redundancy and improved read/write speeds.
If one drive fails in each mirrored set, the system can still function without data loss due to the mirroring.
This setup provides a balance between data protection and performance.
While more hard disks can be used in RAID 10 for larger capacities and better performance, the minimum requirement is four hard disks.
Using fewer drives would not allow for the necessary mirrored sets and striping required for RAID 10.
By implementing a RAID 10 solution with four hard disks on the video editor's workstation, you can help safeguard against data loss in case of drive failure, ensuring the integrity and availability of important video editing data.
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How do you solve this problem quickkkkkkk!!!!!!!
Answer:
Ohh Pythagorean theorem question! Well, A squared plus B squared = C squared, so 44.82187.
Help me ASAP please
Answer:
D. F(x) = (x - 1)^4
Step-by-step explanation:
To shift a graph h units horizontally, replace x by x - h.
The shift is 1 unit to the right, so the shift is positive 1.
h = 1
x - h = x - 1
Replace x with x - 1.
G(x) = x^2 becomes F(x) = (x - 1)^4
Which segments are skewed
Answer:
AB, DC, ED, GA
Step-by-step explanation:
You want to identify the segments that are skew to edge FH of cuboid ABCDEFGH.
Skew linesTwo lines are skew when no plane exists that can contain them both. That is, skew lines are not parallel and do not intersect.
Cuboid ABCDEFGH has 12 edges. Of those, 3 are parallel to FH, and 4 intersect FH. The remaining edges are skew to FH:
AB, DC, ED, GA . . . . . segments skew to FH
Jonczyk Company is considering two different, mutually exclusive capital expenditure proposals. Project A will cost $454,000, has an expected useful life of 13 years and a salvage value of zero, and is expected to increase net annual cash flows by $68,000. Project B will cost $300,000, has an expected useful life of 13 years and a salvage value of zero, and is expected to increase net annual cash flows by $47,000. A discount rate of 9% is appropriate for both projects. Click here to view PV table.
Calculate the net present value and profitability index of each project. (If the net present value is negative, use either a negative sign preceding the number e.g. -45 or parentheses e.g. (45). Round present value answers to 0 decimal places, e.g. 125 and profitability index answers to 2 decimal places, e.g. 15.52. For calculation purposes, use 5 decimal places as displayed in the factor table provided, e.g. 1.25124.)
Net present value is a measure of profitability. The NPV of an investment is the net cash inflow received over the project's life, less the initial cash outflow, adjusted for the time value of money.
A higher NPV means the project is more lucrative. The profitability index measures the benefit-cost ratio of a project and is calculated by dividing the present value of future cash flows by the initial cash outflow. A profitability index greater than one indicates that the project will be profitable, whereas a profitability index less than one indicates that the project will not be profitable.
Calculation of Net Present Value (NPV) of Project AInitial Outlay = $454,000Net annual cash flows = $68,000Discount Rate = 9%Use the PV of an annuity of $1 table to determine the PV of net cash flows.Using the formula for NPV,NPV of Project A = PV of net cash flows – Initial OutlayNPV of Project A = 68,000 × 7.63930 – 454,000NPV of Project A = $56,201.85Calculation of Profitability Index of Project AProfitability Index of Project A = Present value of future cash flows / Initial OutlayProfitability Index of Project A = 68,000 × 7.63930 / 454,000Profitability Index of Project A = 1.14
Calculation of Net Present Value (NPV) of Project BInitial Outlay = $300,000Net annual cash flows = $47,000Discount Rate = 9%Use the PV of an annuity of $1 table to determine the PV of net cash flows.Using the formula for NPV,NPV of Project B = PV of net cash flows – Initial OutlayNPV of Project B = 47,000 × 6.10338 – 300,000NPV of Project B = $37,100.86Calculation of Profitability Index of Project BProfitability Index of Project B = Present value of future cash flows / Initial OutlayProfitability Index of Project B = 47,000 × 6.10338 / 300,000Profitability Index of Project B = 0.96
The NPV and profitability index calculations show that project A is the better investment since it has a higher NPV and profitability index than project B.
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What happens when a figure is dilated .
Answer:
A dilation is a transformation that produces an image that is the same shape as the original, but is a different size. A dilation that creates a larger image is called an enlargement. A dilation that creates a smaller image is called a reduction. A dilation stretches or shrinks the original figure.
The graph below plots the values of y for different values of x:
plot the ordered pairs 1, 8 and 2, 3 and 3, 0 and 4, 1 and 5, 2 and 6, 1
What does a correlation coefficient of −0.2 say about this graph?
x and y have a strong, positive correlation
x and y have a weak, positive correlation
x and y have a strong, negative correlation
x and y have a weak, negative correlation
A correlation coefficient is a numerical measure of some type of correlation, meaning a statistical relationship between two variables.
Hence, the correlation coefficient is \(-0.9\), i.e., \(x\) and \(y\) have a strong, negative correlation
What is a correlation coefficient?
A correlation coefficient is a numerical measure of some type of correlation, meaning a statistical relationship between two variables.
The variables may be two columns of a given data set of observations, often called a sample or two components of a multivariate random variable with a known distribution.
As we know that the correlation coefficient is a measure of the strength of the straight line or linear relationship between two variables. Correlation coefficients are expressed as values between \(+1\) and \(-1\).
So,
\((1,8),(2,3),(3,0),(4,1),(5,2),(6,1)\)
As per the Excel tools i.e., CORREL function the correlation coefficient is \(-0.9\).
Hence, the correlation coefficient is \(-0.9\), i.e., \(x\) and \(y\) has a strong, negative correlation.
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A small object at rest on a frictionless surface is attached to a wall by a frictionless spring. The object is pulled away from the wall to stretch the spring and
then released. The graph shows the displacement d, in centimeters, of the object from its resting position as a function of time t, in seconds, as the object
oscillates. Which of the following statement(s) is/are true?
find the product of the three smallest, positive, non-integer solutions to \[\lfloor x \rfloor \lceil x \rceil
The product of the three smallest, positive, non-integer solutions to the expression [x][x] is \(\(\frac{5}{2}\) times \(\frac{7}{2}\) times \(\frac{9}{2} = \frac{315}{8}\)\).
To find the solutions, we first look at the floor and ceiling functions. The floor function ( x ) rounds a number down to the nearest integer, while the ceiling function (x ) rounds a number up to the nearest integer. The three smallest positive, non-integer solutions occur when (x) is between two consecutive integers.
Let's consider the values of [x] between 2 and 3. In this range, [x]is 2, and [x] is 3. Therefore, the first solution is [x]=5/2. Similarly, between 3 and 4, we have [x]=3 and [x]=4, giving the second solution as [x]=7/2. Finally, between 4 and 5, we have [x]=4 and [x]=4, leading to the third solution [x]=9/2.
To find the product of these solutions, we multiply them together: 5/2×7/2×9/2 = 315/8. Thus, the product of the three smallest, positive, non-integer solutions to [x][x]is 315/8
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I need help with this:
Answer:
if of all parallel lines can't touch
Step-by-step explanation:
A rectangle has a length of 12 mm and a width of 15 mm. A new rectangle was created by multiplying all of the dimensions by a scale factor of 1 3 . A rectangle with length 12 millimeters and width 15 millimeters. A smaller rectangle with length 4 millimeters and width 5 millimeters. Which statement best describes the change in the perimeter of the new rectangle? The new perimeter will be One-half times the perimeter of the original rectangle. The new perimeter will be One-third times the perimeter of the original rectangle. The new perimeter will be 2 times the perimeter of the original rectangle. The new perimeter will be 3 times the perimeter of the original rectangle.
Answer:
4 mm by 5 mm1/3 the perimeter of the originalStep-by-step explanation:
When each of the dimensions is multiplied by 1/3, the result is a rectangle that is ...
(12 mm)·(1/3) by (15 mm)·(1/3) = 4 mm by 5 mm
The result is ...
a smaller rectangle with length 4 millimeters and width 5 millimeters
__
The perimeter of the smaller rectangle has the same ratio to the original that the side lengths do.
The new perimeter will be 1/3 times the perimeter of the original rectangle.
The change in perimeter of the new rectangle will be 3 times the perimeter of the original rectangle.
What is the perimeter of a rectangle?For a known length and width of a rectangle, the expression for calculating the perimeter of a rectangle is 2(L × w).
From the given information:
A rectangle's length = 12 mm, and width = 15 mm
Using a Scale factor of 1 : 3A new smaller rectangle's length = 4 mm, and width = 5 mmTherefore, we can deduce that the change in perimeter of the new rectangle will be 3 times the perimeter of the original rectangle.
This is because by using the scale factor:
\(\mathbf{\dfrac{1}{3}(12) \times \dfrac{1}{3}(15)}\)
We can get the value for the length and width of the new smaller rectangle as 4 mm and 5 mm respectively.
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What are the solutions of x^2=-7x-8
The solutions to the quadratic equation x² = -7x - 8 are x equals \(\frac{-7 - \sqrt{17}}{2}, \frac{-7 + \sqrt{17}}{2}\).
What are the solutions to the quadratic equation?Given the quadratic equation in the question:
x² = -7x - 8
To find the solutions of the quadratic equation x² = -7x - 8, we can rearrange it into standard quadratic form, which is ax² + bx + c = 0, and apply the quadratic formula.
x² = -7x - 8
x² + 7x + 8 = 0
a = 1, b = 7 and c = 8
Plug these into the quadratic formula: ±
\(x = \frac{-b \± \sqrt{b^2 -4(ac)}}{2a} \\\\x = \frac{-7 \± \sqrt{7^2 -4(1*8)}}{2*1} \\\\x = \frac{-7 \± \sqrt{49 -4(8)}}{2} \\\\x = \frac{-7 \± \sqrt{49 - 32}}{2} \\\\x = \frac{-7 \± \sqrt{17}}{2} \\\\x = \frac{-7 - \sqrt{17}}{2}, \frac{-7 + \sqrt{17}}{2}\)
Therefore, the values of x are \(\frac{-7 - \sqrt{17}}{2}, \frac{-7 + \sqrt{17}}{2}\).
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Find the image of -2 under the function f(x) =2x-1
Answer:
- 5
Step-by-step explanation:
Substitute x = - 2 into f(x)
f(- 2) = 2(- 2) - 1 = - 4 - 1 = - 5