Explain the difference between observed frequency and expected frequency as it relates to Chi-Square test.
Answers
Answer:
Step-by-step explanation:
A Chi-square test is used to test the test of independence between rows and columns, contingency tables. It is a test related to frequencies. The observed frequency is a given statistical frequency known as the actual frequency, the expected frequency is known as the theoretical frequency is derived from the study by using the sum total of the row and total in the column divided by their corresponding sample size.
Related Questions
what is 999.09344471 rounded to the nearest square kilometer?
Answers
The nearest kilometers to 999.09344471 km is 1000 km.
Given value is 999.09344471 Km.
We have to calculate the round off value to the nearest kilometers. we know that after the decimal if the value of tenth place is 5 or bigger than 5 then we add 1 to the tens place digit, this is the fundamental rule of rounding off.
Now on following this rule from the very right hand side up to the tenth place digit we come to the conclusion that only the value after the decimal (934) is to be rounded off which is (900).
So 999.09344471 km is finally becomes 999.900 km after rounding of to nearest hundredth value.
Again rounding off 999.900 km to nearest km so it becomes 1000 km.
The nearest kilometers to 999.09344471 km is 1000 km.
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Please answer B only 25 points
Ty
Answers
2) P= 9, Q = 2
3) P = 8 Q = 1
Alfonso is trying to move a new sofa into his apartment. Unfortunately, he forgot to measure the size of his doors and it turns out the sofa won´t fit through! He must therefore lift the sofa from the street and bring it into the apartment through his window.
The sofa has a mass of 160Kg. With a rope Alfonso can pull upwards with a force of 400N.
Calculate how much mass Alfonso can lift alone. State whether he will need to ask for help from his friends, and if so, how many friends will he need to ask?
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Answer:
680 i thnink
Step-by-step explanation:
A rocking horse has a weight limit of 60 pounds. What percentage of the weight limit is 33 pounds?
Answers
Answer:
57 pounds weight is 95 percent of the limit i think
Step-by-step explanation:
Answer:
55%
Step-by-step explanation:
50% of 60 is 30
5% of 60 is 3
an 8cm cube is cut into several small cubes of edge 2cm.how many cubes are formed???
Answers
which of these steps will eliminate a variable in this system 6x - 3y = 8
23 + 6y = 16
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The values of x and y after solving this system of equations will be 32/35 and -88/105 respectively.
What are system of equations?System of equations are a set of two or more equations that contain variables. The values of the variables can be calculated using either method of elimination or substitution. The values of the variables must then satisfy all the equations.
What is the method of elimination?For a set of two equations, in elimination we make the coefficient of any one variable equal to the coefficient of the same variable in the other equation. This can be done by multiplying or dividing the whole equation accordingly. Then we subtract the equations from each other and solve for one variable.
6x - 3y = 8 (multiplying this equation by -2 to make the coefficient of y equal to that of in the equation 23x + 6y = 16)
Now are equations are
-12x + 6y = -16 and 23x + 6y = 16
subtracting eq 1 from eq 2 gives,
35x = 32 (Note that y has now been eliminated)
x = 32/35
Substituting this value of x in any one of the equations will then give the value of y to be -88/105
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decrease 600 by 3.5%
Answers
Answer:
579
Step-by-step explanation:
3.5/100 × 600 = 21
600 - 21 = 579
600 - 21 = 579
579
During a thunderstorm yesterday, 600 millimeters of rain fell in 30 minutes. What is the unit rate for millimeters per minute?
Answers
9514 1404 393
Answer:
20 mm/min
Step-by-step explanation:
To find the rate in mm per minute, divide mm by minutes:
(600 mm)/(30 min) = 20 mm/min . . . unit rate
i need help with this pls help pls show how you got it also
Answers
The range is from -3 to ∞
What is the domain of the equation?
Answers
The domain of the equation include the following: D. all real numbers.
What is a domain?In Mathematics and Geometry, a domain refers to the set of all real numbers (x-values) for which a particular function (equation) is defined.
How to identify the domain any graph?In Mathematics and Geometry, the horizontal portion of any graph is used to represent all domain values and they are both read and written from smaller to larger numerical values, which simply means from the left of any graph to the right.
By critically observing the graph shown in the image attached above, we can reasonably and logically deduce the following domain and range:
Domain = [-∞, ∞] or all real numbers.
Range = [-4, ∞}
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i need some help here
Answers
The value of x, considering the Pythagorean Theorem, is given as follows:
x = 9.
What is the Pythagorean Theorem?The Pythagorean Theorem states that in the case of a right triangle, the square of the length of the hypotenuse, which is the longest side, is equals to the sum of the squares of the lengths of the other two sides.
Hence the equation for the theorem is given as follows:
c² = a² + b².
In which:
c > a and c > b is the length of the hypotenuse.a and b are the lengths of the other two sides (the legs) of the right-angled triangle.The sides for the problem are given as follows:
15 and 8 (segment of 8 is the radius, which is the distance from the center to a point on the circumference of the circle).
Hence the hypotenuse is obtained as follows:
h² = 15² + 8²
h² = 289
h = 17.
Hence the value of x is obtained as follows:
x = 17 - 8
x = 9.
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A local gas station waits 4 days to receive its delivery after he calls and places an order. The amount of gas that the station sells in a day is independent of other days and follows a Normal distribution with mean 1000 gallons and standard deviation of 400 gallons. Which one of the statements is true?
a. The chance of selling more than 1400 is around 15%
b. The chance of selling more than 1400 is around 5%
c. The chance of selling more than 1400 is zero
d. The chance of selling more than 1400 is around 10%
Answers
Answer:
C
Step-by-step explanation:
When you are multiplying like bases with exponents, you will also multiply the exponents together and leave the same base in your solution.
TRUE or FALSE?
Answers
come on now
\(\underset{\textit{like-bases with exponents}}{5^{11}\cdot 5^3\cdot 5^{17}}\implies \stackrel{\textit{add the exponents}}{\underset{\textit{keep the base}}{5^{11+3+17}}}\implies 5^{31}\)
the rate of change of sales tax on trousers is 10% one can buy a pair of trousers at$660. What is the marked price?
Answers
Step-by-step explanation:
Total price = Marked price + Sales tax
= Marked price + (0.1 * Marked price)
= 1.1 * Marked price.
Since the total price is $660, the marked price is $660 / 1.1 = $600.
12 pens cost £3.00. How many pens can be bought for £8?
Answers
Answer:
You can buy 32 pens for £8.
Step-by-step explanation:
12÷3 = 4 ---> which means you get 4 pens for £1.
since you get 4 pens for £1, you need to multiply 4x8 to find how many pens you can buy for £8.
4x8 = 32.
You can buy 32 pens for £8.
hope this helps !
have an amazing day : )
For each proof, you must include (i.e., write) the premises in that proof. I do not want to see any proofs without premises. YOU CANNOT USE CONDITIONAL PROOF (CP), INDIRECT PROOF (IP), OR ASSUMED PREMISES (AP). Additionally, use only the 18 rules of inference found in the text and in the notes. If you use an inference rule such as Resolution or Contradiction, you will lose points. 1. 1. C ---> (~D ---> ~X)2. C3. X /D (Note: /D means you have to prove that D validly follows from the premises.)_________________________________________________________________2. 1. A ---> ~B2. B3. ~A ---> (C v ~ B) /C____________________________________________________________________3. 1. A ---> ~D2. ~D ---> (~B v ~~A)3. A4. B /~~A___________________________________________________________________Note:you don't need to use DN and when you have iterated negation signs, do not use parentheses.~~A does not need parentheses.
Answers
B is true, so we can conclude ~~A by disjunctive syllogism.
This proof is based on the inference rules you provided.
D Proof: Premises:
C ---> (~D ---> ~X)
The Modus Ponens Rule was used.
Finally, X /D
Explanation: Using Modus Ponens, we can conclude that D ---> X from premises 1 and 2.
Because premise 2 is true, we can conclude X via modus tollens.
We can conclude that D must be false because X is true.
Evidence for C:
Conditions: A ---> B B
Modus Tollens is the rule that was used.
Finally, C / A
Explanation: Using Modus Tollens, we can conclude from premises 1 and 2 that A.
Because A is false in premise 1, we can conclude that B is true.
Because premise 2 is true, we can conclude C using disjunctive syllogism.
Proof for ~~A:
Premises:
A ---> ~D
~D ---> (~B v ~~A)
A
B
Rule used: Modus Ponens
Conclusion:
~~A /B
Explanation:
From premise 1 and 3, using Modus Ponens, we can conclude that ~D.
From premise 2 and ~D, using Modus Ponens, we can conclude that ~B v ~~A.
From premise 4, B is true, so we can conclude ~~A by disjunctive syllogism.
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One brand of cola co fizz is sold in packs of 4*500ml for 2.50 another brand colo is sold in packs of 10 330mlfo $2 which brand is more expensive
Answers
Based on the given information, the second brand, Cola, is the more affordable option in terms of cost per milliliter compared to Co Fizz.
To determine which brand of cola is more expensive, we need to compare the cost per unit volume for each brand.
For the first brand, Co Fizz, a pack contains 4 bottles, and each bottle has a volume of 500 ml. The cost of the pack is $2.50. Therefore, the total volume in a pack is 4 * 500 ml = 2000 ml. To find the cost per milliliter (ml), we divide the total cost by the total volume: $2.50 / 2000 ml = $0.00125 per ml.
For the second brand, Cola, a pack contains 10 bottles, and each bottle has a volume of 330 ml. The cost of the pack is $2. Therefore, the total volume in a pack is 10 * 330 ml = 3300 ml. To find the cost per milliliter (ml), we divide the total cost by the total volume: $2 / 3300 ml ≈ $0.000606 per ml.
Comparing the two brands, we can see that the cost per milliliter for Co Fizz is $0.00125, while the cost per milliliter for Cola is approximately $0.000606.
Since the cost per milliliter for Co Fizz is higher than the cost per milliliter for Cola, it can be concluded that Co Fizz is more expensive in terms of price per unit volume.
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!! This one too!! anybody
Answers
Answer:
-2/5
Step-by-step explanation:
You can solve this by doing that rise/run
rise/run = -2/5
Slope = -2/5
What's this? I don't understand
Answers
Answer:
There are two solutions
Step-by-step explanation:
The two equations intersect in two points therefore you willl have two solutions
Answer:
C. two solutions
Step-by-step explanation:
Hope this helped have an amazing day!
A total of 27 students are in your class. There are nine more males than females.
How many females are in your class?
Answers
For the following word problems, first write a system of equations then solve for full marks.
3. The perimeter of a rectangle is 64 cm. Twice the width is 4 cm more than the length.
Find the dimensions of the rectangle.
Answers
The length of rectangle is 20cm and width is 12cm.
Let the length is x cm and width is y cm.
then perimeter 2(x+y) =64 cm
=> x+y = 64/2 = 32
=> x + y = 32 .............(1)
and according to question twice the width is 4cm more than length so,
2y = x + 4
=> 2y -x = 4 .............(2)
now we add these two equation to find the value of x and y.
3y = 36
=> y = 12
now put the value of y on any equation to find value of x ,
x +12 = 32
=> x = 32 -12 = 20
so, the length of rectangle is 20cm and width is 12cm.
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2x^2 + 7x - 15 = 0
If r and s are two solutions of the equation aboveand r>s, which of the following is thevalue of r-s?
Answers
Given the equation:
\(2x^2+7x-15=0\)Where r and s are two solutions of the equation and r is greater than x.
Let's solve for r - s.
To find the solutions, let's use the quadratic formula:
\(x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}\)Where:
a = 2
b = 7
c = -15
Thus, we have:
\(\begin{gathered} x=\frac{-7\pm\sqrt[]{7^2-4(2)(-15)}}{2(2)} \\ \\ x=\frac{-7\pm\sqrt[]{49+120}}{4} \\ \\ x=\frac{-7\pm\sqrt[]{169}}{4} \\ \\ x=\frac{-7\pm13}{4} \\ \end{gathered}\)Solving further:
\(\begin{gathered} x=\frac{-7-13}{4},\frac{-7+13}{4} \\ \\ x=\frac{-20}{4},\frac{6}{4} \\ \\ x=-5,\frac{3}{2} \end{gathered}\)The solutions to the equation are: -5 and 3/2
SInce r is greater than s, we have:
r = 3/2
s = -5
Hence, to find r - s, let's subtract -5 from 3/2:
\(\begin{gathered} r-s=\frac{3}{2}-(-5) \\ \\ =\frac{3}{2}+\frac{5}{1} \\ \\ =\frac{3(1)+5(2)}{2} \\ \\ =\frac{3+10}{2} \\ \\ =\frac{13}{2} \end{gathered}\)Therefore, the value of r - s is:
\(\frac{13}{2}\)ANSWER: B
\(\frac{13}{2}\)
for cos(theta) = -3/5, and pi/2 < theta < pi, find the following trig values
sin theta
tan theta
csc theta
sec theta
cot theta
Answers
For the given range of theta, cos(theta) is negative, which means that theta is in the third or fourth quadrant. In these quadrants, the sine function is positive, the tangent function is negative, and the cotangent function is negative.
Since cos(theta) = -3/5, we can use the Pythagorean identity to find the value of sin(theta):
sin^2(theta) + cos^2(theta) = 1
sin^2(theta) = 1 - cos^2(theta)
sin^2(theta) = 1 - (-3/5)^2
sin^2(theta) = 1 - 9/25
sin^2(theta) = 16/25
sin(theta) = sqrt(16/25) = 4/5
Therefore, the value of sin(theta) is 4/5.
We can also use the identity cot(theta) = 1/tan(theta) to find the value of cot(theta):
cot(theta) = 1/tan(theta)
cot(theta) = 1/(sin(theta)/cos(theta))
cot(theta) = cos(theta)/sin(theta)
cot(theta) = (-3/5)/(4/5)
cot(theta) = -3/4
Therefore, the value of cot(theta) is -3/4.
The values of the other trigonometric functions can be found using the definitions of these functions:
tan(theta) = sin(theta)/cos(theta) = (4/5)/(-3/5) = -4/3
csc(theta) = 1/sin(theta) = 1/(4/5) = 5/4
sec(theta) = 1/cos(theta) = 1/(-3/5) = -5/3
Therefore, the values of the trigonometric functions for the given range of theta are:
sin(theta) = 4/5
tan(theta) = -4/3
csc(theta) = 5/4
sec(theta) = -5/3
cot(theta) = -3/4
Find the value of each determinant:
Help!
Answers
Answer:
Matrix 1: -4269
Matrix 2: 1768
Matrix 3: 647.3561
Step-by-step explanation:
Matrix 1: \((7*19)-(31*142)=-4269\)
Matrix 2: 1768
\(\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right]\)
Determinant = \(a(ei-fh)-b(di-fg)+c(dh-eg)\)
Matrix 3: 647.3561
\(\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right]\)
Determinant = \(a(ei-fh)-b(di-fg)+c(dh-eg)\)
Carl is making accessories for the soccer team. He uses 773.85 inches of fabric on headbands for 29 players and 4 coaches. He also uses 279.56 inches of fabric on wristbands for just the players. How much fabric was used on a headband and wristband for each player?
Answers
Your answer might be 16.31 inches for each headband and wristband for each player.
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Hope this helps!
Joke: What has ears but can’t hear a thing?
Answer: A cornfield.
Have a great day and God bless! :D
If 78 is increased by 40% what is the new amount
Answers
Given that:
Then, using the rule of three:
\(\begin{gathered} x=\frac{78\cdot140\%}{100\%} \\ \\ \therefore x=109.2 \end{gathered}\)
For which value of x is this equation true?10 + x ÷ 3 = 12
Answers
Answer:
Hi
please mark brainliest ❣️
Thanks
Step-by-step explanation:
10 + x / 3 = 12
Cross multiply
10 + x = 12× 3
10 + x = 36
Collect like terms
x= 36 - 10
x = 26
Find the solution to the equation 1/2x +4 = 2/3x + 1
Answers
Answer:
x = 18
Step-by-step explanation:
hope it helps:)
A shipping company charged $15 to ship a package and 5% to insure the package.What was the total cost to ship this particular item?
Answers
Answer:
5% of 15 is 0.75 i think
Step-by-step explanation:
15/5% is 0.75
First we need to calculate how much the company charges in insurance. 5% is the same as 0.05, so we multiply $15 by 0.05 to find the 5% of the package cost it takes to insure the package. This gets us $0.75. We then have to add this new insurance price of $0.75 to the initial shipping cost of $15 to get the total cost to ship this item. This gets us a total of $15.75.
$15 x 0.05 = $0.75
$15 + $0.75 = $15.75
The problem is attached.
Answers
Answer:
Cosec θ = – 25/24
Step-by-step explanation:
From the question given, we obtained the following information:
Tan θ = – 24/7
Cosec θ =?
Tan θ is negative in the forth quadrant.
Please see attached photo.
Tan θ = Opposite /Adjacent
Opposite = – 24
Adjacent = 7
Hypothenus = x
Thus, we can obtain the value of x by using the pythagoras theory as illustrated below:
x² = (–24)² + 7²
x² = 576 + 49
x² = 625
Take the square root of both side
x = √625
x = 25
Next, we shall determine Sine θ. This can be obtained as follow:
Opposite = – 24
Hypothenus = 25
Sine θ = ?
Sine θ = Opposite /Hypothenus
Sine θ = –24/25
Finally, we shall determine the Cosec θ. This can be obtained as follow:
Cosec θ = 1 /Sine θ
Sine θ = –24/25
Cosec θ = 1 ÷ –24/25
Cosec θ = 1 × – 25/24
Cosec θ = – 25/24
