The lowest possible value of R² is 0 and the highest possible value is 1. Put simply, the better a model is at making predictions, the closer its R² will be to 1.
The coefficient of determination (R²) measures how well a statistical model predicts an outcome. The outcome is represented by the model’s dependent variable.
The lowest possible value of R² is 0 and the highest possible value is 1. Put simply, the better a model is at making predictions, the closer its R² will be to 1.
Suppose that you perform a simple linear regression that predicts students’ exam scores (dependent variable) from their time spent studying (independent variable).
If the R2 is 0, the linear regression model doesn’t allow you to predict exam scores any better than simply estimating that everyone has an average exam score.
If the R2 is between 0 and 1, the model allows you to partially predict exam scores. The model’s estimates are not perfect, but they’re better than simply using the average exam score.
If the R2 is 1, the model allows you to perfectly predict anyone’s exam score.
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The relative values of the mean and median are typically of data that have a significant skew to the left what are the relative values of the mean and median
The required, mean for the specific data set will also be greater than the median.
What is Statistic?Statistics is the study of mathematics that deals with relations between comprehensive data.
Here,
The relative values of the mean and median are typical of data that have a significant skew to the left, If the data set significant skew to the left implies that the mean of the data set is greater than the median of the data set.
Thus, the required, mean for the specific data set will also be greater than the median.
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Let x be a numeric vector and suppose you want to know how many entries of x are strictly less than 5. Create a new variable y which is equal to the number of entries of x that are (strictly) less than 5. For example, if x <- c(-5, 7, 9, 3, 14, 9, 5, 10, 2, -2, 0, 12) then your variable y should be equal to 6. Your code for y should be expressed in terms of x so that for different vectors x the same expression for y will always give the correct answer. Also, create another variable z which is equal to the number of entries of x that are strictly between -5 and 5. Like y, the variable z should also be expressed in terms of x so that the same expression for z works for various vectors x. The autograder will test your answer for several vectors x.
To calculate y, we use the sum() function with an argument of x < 5 to count the number of entries in x that are strictly less than 5. To calculate z, we use the sum() function with an argument of (x > -5) & (x < 5) to count the number of entries in x that are both greater than -5 and less than 5.
y = sum(x < 5)
z = sum((x > -5) & (x < 5))
y = sum(x < 5)
= sum(TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, TRUE, FALSE, TRUE, TRUE, TRUE, FALSE)
= 5
z = sum((x > -5) & (x < 5))
= sum(TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, TRUE, FALSE, TRUE, FALSE, TRUE, FALSE)
= 4
The first variable, y, is the number of entries of x that are strictly less than 5. To calculate y, we can use the sum() function with an argument of x < 5. This will count the number of entries in x that are less than 5. For example, if
x <- c(-5, 7, 9, 3, 14, 9, 5, 10, 2, -2, 0, 12), then y will be equal to 6 because there are 6 entries in x that are strictly less than 5.
The second variable, z, is the number of entries of x that are strictly between -5 and 5. To calculate z, we can use the sum() function with an argument of (x > -5) & (x < 5). This will count the number of entries in x that are both greater than -5 and less than 5. For our example, z will be equal to 4 because there are 4 entries in x that are strictly between -5 and 5.
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overall mark for english test for 15 pupils is 82. If one more pupil being added, the overall mark become 85. find the mark of the pupil who recently added
The marks of the pupil who was recently added is 3.
What are algebraic expressions?In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context.Mathematical symbols can designate numbers (constants), variables, operations, functions, brackets, punctuation, and grouping to help determine order of operations and other aspects of logical syntax.Given is that overall mark for english test for 15 pupils is 82. If one more pupil being added, the overall mark become 85.
For 15 peoples, the overall mark for english is 82. When one more person is added, the overall mark become 85. Then, the marks of the pupil who recently added was -
85 - 82
3
Therefore, the marks of the pupil who was recently added is 3.
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is this function's avarage rate of change over the interval -1
Yes , it is a average rate of change over the interval -1
What is average rate of change?
It is a measure of how much the function changed per unit, on average, over that interval. It is derived from the slope of the straight line connecting the interval's endpoints on the function's graph.
suppose function y = x+1
then at interval [ -1 , 1]
at x= -1
y= 0
and at x= 1
y= 2
Rate of change = (y2 - y1)/(x2 - x1) = (2-0) / -1-1
Rate of change = 2/-2
= -1
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PLEASE HELP DUE SOON!!
SO CONFUSED AND NEED HELP!!
The Mean is 350 and Median is 383.3
What is Mean of Grouped Data?The first step in calculating the mean of grouped data is to establish the midpoint (also known as a class mark) of each interval or class. The frequencies of the relevant classes must then be multiplied by these midpoints. The mean value is determined by dividing the total number of values by the sum of the products.
Given:
CI F x d Fd cf
100 - 200 2 150 -2 4 2
200 - 300 2 250 -1 -2 4
300 - 400 3 350 0 0 7
400 - 500 6 450 1 6 13
n= 13
Mean = 350+ 0/13 x 100
Mean = 350+0
Mean = 350
Hence, the Mean is 350 and Median is 383.3
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Writing linear equations in slope-intercept form. Write the equation of each linear below:
The linear equations in slope-intercept form are y=2x+3 , y=-1x-2 , y=-3x+4 and y = 3x .
What is linear equation ?
Linear equation can be defined as equation in which highest degree is one.
Given ,
We have to write linear equations in slope intercept form.
So,
An equation in the slope-intercept form is written as
y = mx + b
Where m is the slope of the line and b is the y-intercept. You can use this equation to write an equation if you know the slope and the y-intercept.
So, from given graphs we can say that
y - 3 = 2x
y=2x+3
y + 2 = -x
y=-1x-2
y - 4 = -3x
y=-3x+4
y - 0 = 3x
y=3x+0
y = 3x
Therefore, The linear equations in slope-intercept form are y=2x+3 , y=-1x-2 , y=-3x+4 and y = 3x .
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which of the following inequalities are equivalent to the inequality $x<3$ , where $b$ is a constant? select all that apply.responses$x-b-3.0$$x-b-3<0$$x<3-b$$x<3-b$$0>b-x 3$0 is greater than b minus x plus 3$-3
The inequalities that are equivalent to the inequality $x<3$ are:
$x<3-b$
$x-b<3$
Note that $x-b-3.0$ and $x-b-3<0$ are not equivalent to $x<3$
and -3 is not an inequality.
Find the value of x in the diagram.
Answer: x = 57°
Step-by-step explanation:
63 + x + 2x + 183 - x = 360 (exterior ∡s of a polygon adds up to 360°)
x + 2x - x = 360 - 63 - 183
2x = 114
x = 57°
The value of x in the given diagram is 57° .
We know that the sum of internal angles of a triangle is equal to 180°.
But here we are given the external angles of the triangle:
Angle 1 : 63 + x
Angle 2 : 2x
Angle 3 : 183 - x
Now , changing the given angles into internal angles , we get:
Angle 1 : 180 - ( 63 + x ) = 117 - x
Angle 2 : 180 -2x
Angle 3: 180 -(183-x) = x-3
Now,
(117-x) + (180 -2x) + (x-3) =180
114 - 2x = 180
x = 114/2=57
Therefore, The value of x in the given diagram is 57° .
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Billy remembers numbers using images that look somewhat like each number: 0 is a ball, 1 is a stick, 2 is a hanger, 3 is a comb, and 4 is a kite. Using Billy’s number images, Ryan remembered a 3-digit phone extension with this story: A person uses a hanger for his coat, then uses a stick to hit a ball. What number is Billy likely remembering?
Answer:
Step-by-step explanation:
210
ap exam a small class of five statistics students received the following scores on their ap exam: 5, 4, 4, 3, 1. a) calculate the mean and standard deviation of these five scores.
The mean of the score is 3.4 and the standard deviation is 3.2.
Scores of students = 5, 4, 4, 3 and 1
When determining the mean of a group of numbers, add up all the numbers and divide by the total number in the group.
Calculating the mean -
= Sum of total values / Total values
= 5 + 4 + 4 + 3 + 1 / 5
= 17/5
= 3.4
By averaging the squared deviations of each integer from the mean, you may get the variance before calculating the standard deviation.
Calculating the Standard deviation -
σ = √ ∑ (xi - u)²/n
σ² = (1² + (3.4 - 1)² + (3.4 - 4)² + (3.4 - 4)²+ (3.4 - 5)²) / 5
= 3.2
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Please help, I’ve been stressing out over this to the point where I’m crying.
Answer:
sorry i don't know but you do it very good i promise
which of the following values are examples of a boolean data type? select all that apply.
A Boolean data type is a type of data that can have one of two possible values, either true or false.
Boolean values are used in logic and programming to make decisions and determine the flow of a program. In programming, Boolean values are typically represented with 0 for false and 1 for true. Examples of Boolean values include the following:
• (5 > 4) True
• (10 = 10) True
• (3 < 2) False
• (17 ≥ 17) True
• (“dog” = “cat”) False
• (“hello” ≠ “goodbye”) True
Boolean values are used in programming to perform calculations, make decisions, and control the flow of a program. For example, an if statement is a type of decision making statement that uses a Boolean expression to determine if a certain condition is true or false. If the condition is true, the program will execute the specified code, and if false, the program will skip the specified code. Boolean values are also used to perform calculations, such as in the AND, OR, and NOT logical operators, which are used to combine two or more conditions into one expression. For example, the AND operator would return true if both of the conditions are true and false if either of the conditions are false.
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Suppose that 59% of all students on campus wear glasses. If two students are chosen at random, what is the probability that both of them wear glasses?
The probability that both of them wear glasses is 35%.
How to determine the probabilityThe probability that both students wear glasses is equal to the product of the probability of the first and the second student wearing glasses
If 59% of all students on campus wear glasses, then the probability of a single student wearing glasses is 0.59.
The probability that both students wear glasses is:
0.59 * 0.59 = 0.3481
Approximate
0.59 * 0.59 = 0.35
So, the probability that both students wear glasses is approximately 0.35 or 35%.
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help rn for brainliest its timed hurry
The solution is Option A.
The value of the missing length parallel to the side LN of the triangle is 44
What are similar triangles?If two triangles' corresponding angles are congruent and their corresponding sides are proportional, they are said to be similar triangles. In other words, similar triangles have the same shape but may or may not be the same size. The triangles are congruent if their corresponding sides are also of identical length.
Corresponding sides of similar triangles are in the same ratio. The ratio of area of similar triangles is the same as the ratio of the square of any pair of their corresponding sides
Given data ,
Let the first triangle be represented as ΔLMN
Let the second triangle be represented ΔVUN
The triangles LMN and VUN are similar
The measure of side LV = x
The measure of side LN = 11 + x
So , the corresponding sides of the similar triangles are in ratio
MU / UN = LV / VN
24 / 8 = x / 11
On simplifying the equation , we get
3 = x / 11
Multiply by 11 on both sides of the equation , we get
x = 33
Now , the measure of side LN = x + 11
The measure of side LN = 33 + 11 = 44
Hence , the measure of side LN is 44
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What is the perimeter of the given composite figure?
A) 140 ft
B) 175 ft
C) 170 ft
D) 182 ft
Answer: C = 170
Step-by-step explanation: 45+45+40+40 = 170
Answer:
Your answer is: B) 175ft
Step-by-step explanation:
To fid the perimeter you need to add all the sides together. Don't forget to add the sides that are not labeled, as well as the extra 5ft.
45+45+40+40+5=175
Please help this was due yesterday
Answer:
f(x) = (x +6)(x -5) or f(x) = x² +x -30
Step-by-step explanation:
You want a quadratic function whose zeros are -6 and +5.
FactorsIf p is a zero of the polynomial f(x), then (x-p) is a factor. The two given zeros meant that the factors are ...
f(x) = (x -(-6))·(x -5)
f(x) = (x +6)(x -5) . . . . . . . . simplify a bit
This can be put in standard form by multiplying the factors:
f(x) = x(x -5) +6(x -5) = x² -5x +6x -30
f(x) = x² +x -30 . . . . . . . . simplified quadratic function
The quadratic function of the zeros is f(x) = [tex]x^2+x-30[/tex].
What is quadratic function?
A polynomial function that has one or more variables and a variable having a maximum exponent of two is said to be quadratic. A polynomial of degree 2 is referred to as such because the greatest degree term in a quadratic function is of second degree. There must be at least one second-degree term in a quadratic function. It is a mathematical function.
Here the zeros of the function is -6 and 5.
We know that if zeros of the function is a then the factor is (x-a).
Then,
=> f(x) = (x-(-6))(x-5)
=> f(x) = (x+6)(x-5)
=> f(x) = [tex]x^2+6x-5x-30[/tex]
=> f(x) = [tex]x^2+x-30[/tex]
Hence the quadradic function is f(x) = [tex]x^2+x-30[/tex].
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Find the dot product of u=⟨5,−7⟩ and v=⟨−7,−4⟩.
Answer:
Solution in attached photo.
Step-by-step explanation:
SolutionSteps are in attached photo, to do dot product, make sure you are multiplying x-coordinates of one vector with x-coordinates of another vector, and likewise for y-coordinates.
Solve the following equation, explaining what you did in each step of your solution. After solving the equation, show the steps to check your solution. 3x + 2(4 + 6x) = 113
The solution to 3x + 2(4 + 6x) = 113 is x=7
3x + 2(4 + 6x) = 113
We will multiply the 2 with the brackets
3x+8+12x=13
adding the coefficients os x together
15x+8=113
adding -8 on both the sides
15x=105
dividing both the sides by 15
x=105/15
after division we get
x=7
To check our solution
we first put value of x in our original equation
3x7 + 2(4 + 6x7) = 113
we simplify the equation
21+2(4+42)=113
According to BODMAS we first solve the bracket
21+2(46)=113
now we solve the multiplication part
21+92=113
solving this
113=113
∴ LHS=RHS
Hence the solution is correct.
Therefore, the solution to 3x + 2(4 + 6x) = 113 is x=7
BODMAS is an acronym used to remember the order of precedence for operations. It stands for Brackets of Order(exponents) Division, multiplication, Addition, Subtraction
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Mia's marble shows several colors. 2/3 of the marbles shows some red, 3/4 or the marbles shows some yellow, 6/7 of the marbles shows some blue. Mia has fewer than 250 marbles. How many of Mia's marbles show some blue?
The number of Mia's marbles that show some blue colour would be = 214.3 marbles
What is fraction of a number?A fraction of a number is part of the whole number which is represented as a numerator and a denominator.
The total number of marbles = 250
The fraction of the marble that are red = 2/3
The fraction of the marble that are blue = 6/7
The fraction of the marble that are yellow = 3/4
The quantity of marbles that are blue
= 6/7× 250
= 1500/7
= 214.3 marbles
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At a restaurant, hot chocolate can be purchased in two different cup sizes. A 12-ounce cup costs $3.60 and a 16-ounce cup costs $4.80.
Is the linear relationship between cup size and cost also proportional? Why or why not?
Yes, the constant of proportionality is 0.3.
Yes, there is no constant of proportionality.
No, the constant of proportionality is 0.3.
No, there is no constant of proportionality.
Answer:
Step-by-step explanation:
Yes, the constant of proportionality is 0.3.
Answer:
Yes, the constant of proportionality is 0.3.
Step-by-step explanation:
12-ounce cup costs $3.60 => 1 ounce = $3.60 / 12 = $0.3
16-ounce cup costs $4.80 => 1 ounce = $4.80 / 16 = $0.3
$0.3 = $0.3
Yes, the constant of proportionality is 0.3.
Can you please answer: A metal box in the form of a rectangular prism has an 18 cm by 22cm base and a height of 77cm. The box is to be filled with water, which will then be frozen. When water freezes it expands by approximately 10%. Determine the maximum depth to which the box can be filled with water so that when the water freezes, the ice does not go above the top of the container. Please
Answer:
you have to do this by formula in the copy try this by l×b or b×h
2. Adding 5 to 3/2 of a certain number of cucumbers gives a result of 11 cucumbers. Find
the original number of cucumbers.
3. Seven less than three times a certain number of avocados is equal to that certain
number plus nine. Find the original number of avocados
Part A: the number of cucumbers is 11.
Part B: the number of avocados is 8.
Define the term fraction of the number?Part of a full number and a means of dividing a number equally sized portions are represented by fractions.A fraction is a number that is a component of a whole. By breaking a whole into a number of parts, it is evaluated. For instance, the symbol for half of a complete number or item is 1/2.Part A:
Let x is the number of cucumbers .
Then,
3x - 7 = 26,
3x = 26+7,
3x = 33,
x = 33/3,
x = 11.
Thus, the number of cucumbers is 11.
Part B:
Let x is the number of avocados.
3x - 7 = x + 9
3x - x = 9 + 7
2x = 16
x = 8
Thus, the number of avocados is 8.
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State if the pair of triangles are similar. If so, state how…
The ratio of the sides of the triangle is the same one angle therefore, the two of the given triangles are similar triangles.
What are similar triangles?
If the respective angles are congruent and the corresponding sides are proportional, two triangles are said to be similar. To put it another way, comparable triangles are similar in shape but not necessarily in size. In addition, the triangles are congruent if their corresponding sides are of identical length.
As it we know that for the two triangles to be similar triangles, the ratio of their corresponding sides should be the same.
DC/RD = DB/SD
∠R = ∠C = 68°
So, ΔDCB ≈ ΔRSD by Side Angel Side property.
Hence, we can see that the ratio of the sides of the triangle is the same one angle therefore, the two of the given triangles are similar triangles.
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Find a parametric representation of the solution set of the linear equation. (Enter your answer as a comma-separated list of equations. Use t as your parameter.) 2x - t.6.t-12 X
The solution set of the linear equation 2x - t.6.t-12 = 0 can be represented parametrically as x = t + 6.
A linear equation is an algebraic equation of the form y=mx+b. m is the slope and b is the y-intercept. The above is sometimes called a "linear equation in two variables" where y and x are variables.
The equation 2x - t.6.t-12 = 0 is a linear equation in the variable x and can be solved by isolating x to one side of the equation. To do this, first distribute t on the right side of the equation, giving 2x - 6t^2 + 12 = 0. Then add 6t^2 - 12 to both sides of the equation to get 2x = 6t^2 - 12. Finally, divide both sides of the equation by 2 to get x = 3t^2 - 6. This is a parametric representation of the solution set of linear equations. x is a function of parameter t. The solution is given by x = 3t^2 - 6.
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what is the function for f(x+2)4x2+2-2
The numeric value of the function f(x) = 4x² + 2x + 2 at x = x + 2 is given as follows:
f(x + 2) = 4x² + 20x + 22.
How to find the numeric value of a function or of an expression?To find the numeric value of a function or of an expression, we replace each instance of the variable in the function or in the expression by the value at which we want to find the numeric value.
The function for this problem is defined as follows:
f(x) = 4x² + 2x + 2
To obtain the numeric value at x = x + 2, we replace the two instances of x by x + 2, hence:
f(x + 2) = 4(x + 2)² + 2(x + 2) + 2
f(x + 2) = 4(x² + 4x + 4) + 4x + 4 + 2
f(x + 2) = 4x² + 16x + 16 + 4x + 6
f(x + 2) = 4x² + 20x + 22.
Missing InformationThe problem asks for the numeric value of the function f(x) = 4x² + 2x + 2 at x = x + 2.
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Susie pumps some air into the ball and increases the radius by 1 more inch. If she wants to paint the entire surface of the ball a different color, how much paint will she use?
the answer is 3 because if you add those together you will get 3
Select the term that describes the linear portion in this quadratic equation.
7x^2 - 12x + 16 = 0
Problem of the Week Problem C Ice Box A metal box in the form of a rectangular prism has an 18 cm by 22 cm base and a height of 77 cm. The box is to be filled with water, which will then be frozen. When water freezes it expands by approximately 10%. Determine the maximum depth to which the box can be filled with water so that when the water freezes, the ice does not go above the top of the container.
The extent of a square prism is given by V = l × w × h, so that you can quantity without the hollow would be 18×22×77=30,492cm³
Determine the most intensity to which the container can be packed with water so that when the water freezes, the ice does not move above the top of the container.?
The surface region is:
A = 2 × (l × w + w × h + h × l)
= 2×(18×22+22×77+77×18)
=4862cm³
Now cut a cylindrical hollow through the middle … however in what route??? because the orientation of the hole isn't given, the valuable axis of the cylindrical hole might be parallel to any individual of the three most important axes of the square prism!
[Note: a ‘round’ hole in any other direction – not parallel to a major axis – would have either elliptical ends, or (worse) cut through vertices or even corners.]
Therefore, The extent of a square prism is given by V = l × w × h, so that you can quantity without the hollow would be 18×22×77=30,492cm³
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find the missing side of problems 1,2,5,6,7,10 and 11 . you can try others using sine and cosine from notes
The missing side of problems using sine and cosine is 9.
How do you determine a cosine rule's side?The formula for calculating the triangle's side is: c = [a2 + b2 - 2ab cos C] where the triangle's sides are a, b, and c.
According to the Cosine Rule, the square of any side of a given triangle is equal to the sum of the squares of the other sides minus twice the product of the other two sides multiplied by the cosine of the angle that separates them. Law of cosines and Cosine Formula are other names for the cosine rule.
a2 = b2 + c2 – 2bc cos ∠x
b2 = a2 + c2 – 2ac cos ∠y
c2 = a2 + b2 – 2ab cos ∠z
6^2 + 7^2 = X
x = 9^2
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If you know how to do this comment please
Answer:
15,910
Step-by-step explanation:
(390*26)+5770=15910
On solving the provided question, we cans ay that in the equation 390t + 5770, In the year 2021, the total average credit card debt for a U.S.
household will be 5,910 dollars.
What is equation?A mathematical equation is a formula that joins two statements and uses the equal symbol (=) to indicate equality. A mathematical statement that establishes the equality of two mathematical expressions is known as an equation in algebra. For instance, in the equation 3x + 5 = 14, the equal sign places the variables 3x + 5 and 14 apart. The relationship between the two sentences on either side of a letter is described by a mathematical formula. Often, there is only one variable, which also serves as the symbol. for instance, 2x – 4 = 2.
in the equation 390t + 5770
t = 26
In the year 2021, the total average credit card debt for a U.S.
household will be 5,910 dollars.
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