Answers
Answer:
B
Step-by-step explanation:
cus thats the formula
Related Questions
The table below lists the observed frequencies for all four categories for an experiment. Category Observed Frequency 1 23 2 12 3 34 4 11 The null hypothesis for the goodness-of-fit test is that 40% of all elements of the population belong to the first category, 30% belong to the second category, 20% belong to the third category, and 10% belong to the fourth category. What is the expected frequency for the fourth category? The expected frequencies for the four categories are: Category 1: i Category 2: i Category 3: i Category 4: i What are the degrees of freedom for this test? i The significance level is 10%. What is the critical value of chi-square? O 7.779 O 9.488 O 7.815 O 6.251 What is the value of the test statistic, rounded to three decimal places? i
Answers
The expected frequency for the fourth category is 8.
To calculate the expected frequency for a particular category, we multiply the total number of observations by the expected proportion for that category. In this case, we have the observed frequencies for all four categories, but we need to determine the total number of observations.
To find the total number of observations, we sum up the observed frequencies for all categories:
Total number of observations = observed frequency of category 1 + observed frequency of category 2 + observed frequency of category 3 + observed frequency of category 4
In your case, the observed frequencies are as follows:
Observed frequency of category 1 = 23
Observed frequency of category 2 = 12
Observed frequency of category 3 = 34
Observed frequency of category 4 = 11
Substituting these values into the equation, we get:
Total number of observations = 23 + 12 + 34 + 11 = 80
Now that we know the total number of observations is 80, we can calculate the expected frequency for the fourth category using the null hypothesis proportions.
Expected frequency for category 4 = Total number of observations * Expected proportion for category 4
Expected proportion for category 4 = 10% = 0.10 (based on the null hypothesis)
Substituting the values into the equation, we have:
Expected frequency for category 4 = 80 * 0.10 = 8
Therefore, the expected frequency for the fourth category, according to the null hypothesis, is 8.
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Complete Question:
The table below lists the observed frequencies for all four categories for an experiment.
Category Observed Frequency
1 23
2 12
3 34
4 11
The null hypothesis for the goodness-of-fit test is that 40% of all elements of the population belong to the first category, 30% belong to the second category, 20% belong to the third category, and 10% belong to the fourth category.
What is the expected frequency for the fourth category?
in order to conduct an experiment, subjects are randomly selected from a group of subjects. how many different groups of subjects are possible?
Answers
The number of different groups of subjects possible when randomly selecting from a group of subjects can be determined using the concept of combinations. The total number of possible groups can be calculated by finding the number of combinations of subjects that can be formed from the given group.
When selecting subjects from a group, the order of selection doesn't matter. We can use the combination formula to calculate the number of different groups. If there are 'n' subjects in the group and we want to select 'r' subjects, the number of different groups can be calculated as C(n, r), which is given by
n! / (r! * (n - r)!).
For example, if there are 10 subjects in the group and we want to select 3 subjects, the number of different groups of subjects possible would be
C(10, 3) = 10! / (3! * (10 - 3)!),
which simplifies to 10! / (3! * 7!).
Evaluating this expression will give you the total number of different groups of subjects that can be formed through random selection.
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The vectors vi = 3 and v2 = -3 are 2 -2. linearly independent with 1 Select one: V3 = 7 2 None of these O -8 =-3 -2 O V3 = -3 -3 V3 = -3 3 2
Answers
Among the given options, none of them correctly represent v₃ as a linearly independent vector.
How is this so ?To determine if a set of vectors is linearly independent,we can set up a linear combination equation where the coefficients are variables.
In this case,we will introduce a third vector v₃ = [a, b] and check if there exist non-zero values for a and b that satisfy the equation -
c₁ * v₁ + c₂ * v₂ + c₃ * v₃ = 0
where c₁, c₂, and c₃ are the coefficients of the vectors.
Let's substitute the given vectors into the equation -
c₁ * [3, 2] + c₂ * [-3, -2] + c₃ * [a, b] = [0, 0]
[3c₁ - 3c₂ + ac₃, 2c1 - 2c₂ + bc₃] = [0, 0]
To determine if there exist non-zero values for a and b that satisfy the equation,we can set up a system of equations -
3c₁ - 3c₂ + ac₃ = 0
2c₁ - 2c₂ + bc₃ = 0
Solving the system of equations, we find that for any non-zero values of a and b,the coefficients c₁, c₂, and c₃ must be zero to satisfy the equation.
This means that the vectors v₁ = [3, 2] and v₂ = [-3, -2] are linearly independent.
Among the given options, none of them correctly represent v₃ as a linearly independent vector.
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pls help .. i will mark brainliest !
Answers
Answer:
Option 2, d; corresponding
Step-by-step explanation:
since 6 and 18 are on the same line (line d) and is on the same spot, they are considerd corresponding.
PLEASE HELP ME I NEED HELP FAST
Answers
Steps:
Help me pleaseee!!!!!!
Answers
Answer:
8 or 9
Step-by-step explanation:
Which of the following is a correct interpretation of the expression -4- (-7)?
Choose 1 answer:
The number that is
to the left of -7 on the number line
B
The number that is 4 to the right of -7 on the number line
The number that is 7 to the left of -4 on the number line
D
The number that is 7 to the right of -4 on the number line
Answers
Answer:
I think option (d) is right answer
Answer:
c
Step-by-step explanation:
Each letter in the word THEORETICAL is placed on a separate piece of paper and placed in a
hat. A letter is chosen at random from the hat. What are the odds against pulling a T?
Answers
Answer:
sorry men this is not the answer
Step-by-step explanation
According to exponent rules, when we multiply the same base we _____ the exponents
Answers
Answer:
Add
Step-by-step explanation:
When MULTIPLY exponents with same base, you Keep the base and + ADD the exponents.
[tex] \purple{ \tt{ \huge{ \: ✨Answer ✨ \: }}}[/tex]
[tex] \: \: \: \: \: \: \: \: \: \: \: \: \red{ \boxed{ \boxed{ \huge{ \tt{{ \: add \: }}}}}}[/tex]
According to exponent rules, when we multiply the same base we Add the exponents.PLEASE HELPPPPPPPPPPPPP
Answers
Answer:
with what??????????????
what is the maximum number of interior reflex angles that a hexagon can have?
Answers
really need help if correct i will mark brainliest
Answers
Answer:
11.375
Step-by-step explanation:
Answer:
4
Explanation:
The amount of calculation, if done by hand, will be quite effortful to input.
Given the following, draw the graph and describe the transformations involved.
f (x) = 1/2cos(x - π/2) -1 for - 2π ≤ x < = 2π
Answers
The graph of f(x) = 1/2cos(x - π/2) -1 for -2π ≤ x ≤ 2π is a cosine curve with a maximum value of y = -1/2 and a minimum value of y = -3/2, shifted to the right by π/2 units and compressed vertically by a factor of 1/2.
To draw the graph of the function f(x) = 1/2cos(x - π/2) -1 for -2π ≤ x ≤ 2π, we first need to understand the transformations involved.
The function f(x) = cos(x) has a period of 2π and an amplitude of 1. The function f(x) = cos(x - π/2) is obtained by shifting the graph of f(x) = cos(x) to the right by π/2 units.
This means that the maximum value of f(x) = cos(x - π/2) occurs at x = 0, instead of x = π/2 as in f(x) = cos(x).
Multiplying the function by 1/2 compresses the graph vertically, which reduces the amplitude to 1/2. Finally, subtracting 1 from the function shifts the graph down by 1 unit.
Combining all these transformations, we can see that the graph of f(x) = 1/2cos(x - π/2) -1 for -2π ≤ x ≤ 2π is obtained by taking the graph of y = cos(x), shifting it to the right by π/2 units, compressing it vertically by a factor of 1/2, and then shifting it down by 1 unit.
To draw the graph, we can start with the graph of y = cos(x), which has a maximum value of 1 at x = 0 and a minimum value of -1 at x = π and x = -π. Shifting this graph to the right by π/2 units gives us a maximum value of 1 at x = π/2 and a minimum value of -1 at x = 3π/2 and x = -π/2.
|
|
1.5 | .
| .
| .
1.0 | .
| .
| .
0.5 x
| .
| .
0.0 | .
| .
| .
-0.5 | .
| .
|
-1.0 +-------------------------------------------------------
-2π -3π/2 -π -π/2 0 π/2 π 3π/2 2π
Compressing this graph vertically by a factor of 1/2 reduces the maximum value to 1/2 and the minimum value to -1/2. Finally, shifting the graph down by 1 unit moves the maximum value to y = -1/2 and the minimum value to y = -3/2.
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Given the second-order linear homogeneous ordinary differential equa- tion with variable coefficients dạy d.x2 2.0 (1 – 2:2) d?y dy +m(m+1)y = 0, MER, 0, dc use y(x) = ananth to obtain n=0 8 P}(k)aoxk-2 + P3(k)a1.mk-1 + branth - 0, n=0 - where Pi} (k), P2 (k) are polynomials of degree 2 to be determined. Find the roots of the polynomial equation P) (k) = 0 and comment on the coefficients ao and a, in light of the smaller one of these two roots. Next, using the smaller root, establish an explicit expression for the general term bn, and thus derive a recurrence relation between an+2 and an Finally, using the recurrence relation you have found above, obtain the first three terms of two linearly independent series solutions in their simplest form, one with even and one with odd powers of x.
Answers
Answer:.
Step-by-step explanation:
wuestion
A restaurant customer left $1.05 as a tip. The tax was 6% and the tip was 15% of the cost including
tax.
What was the total bill?
Plz help due at 11:59
I will mark right answer brainliest
Answers
1.05 = 0.21x
x = 5
The total bill is $5
What is 385 divided by 48
Answers
Answer:
the answer is
Step-by-step explanation:
8.0208333333
The math teachers decided to throw a party. One teacher bought 7 cookies and 2 ice cream bars for $10.95. Another teacher bought 4 cookies and 3 ice cream bars for $10.25 . How much did one cookie and one ice cream bar cost, individually?
Answers
Answer:
0.95, 2.15
Step-by-step explanation:
cookie-x
ice bar-y
7x+2y=10.95 (*3)
4x+3y=10.25 (*2)
21x+6y=32.85
8x+6y=20.5
21x-8x=32.85-20.5=12.35
13x=12.35
x=0.95
2y=10.95-7*0.95=4.3
y=2.15
Can someone help me with this. Will Mark brainliest. Need answer and explanations/work. Thank you.
Answers
Answer:
cosine of angle a = 8/17
Step-by-step explanation:
Hello there!
Remember these are the trigonometric ratios
SOC CAH TOA
Sine = Opposite over Hypotenuse (SOH)
Cosine = Adjacent over Hypotenuse (CAH)
Tangent = Opposite over Adjacent (TOA)
And we are asked to find the Cosine of angle A
Remember cosine is adjacent over hypotenuse
Hypotenuse - The longest side
Adjacent - the side that's not the hypotenuse nor the opposite
The adjacent side length of angle A is equal to 8 and the hypotenuse is equal to 17
so the cosine of angle a = 8/17
1: = (3,2,4) m = + +
2: = (2,3,1) = (4,4,1)
(a) Create Vector and Parametric forms of the equations for
lines 1 and 2
Answers
In line 1, the position vector is (3, 2, 4), and the direction vector is (1, 1, 1). By varying the parameter t, we can obtain different points on the line.
In line 2, the position vector is (2, 3, 1), and the direction vector is (4, 4, 1). By varying the parameter s, we can obtain different points on this line.
The vector form and parametric form of the equations for lines 1 and 2 are as follows:
Vector form of line 1:
r = (3, 2, 4) + t(1, 1, 1)
Parametric form of line 1:
x = 3 + t
y = 2 + t
z = 4 + t
Vector form of line 2:
r = (2, 3, 1) + s(4, 4, 1)
Parametric form of line 2:
x = 2 + 4s
y = 3 + 4s
z = 1 + s
The vector form of a line represents the line in terms of a position vector r and a parameter t or s. The position vector r gives a point on the line, and the parameter t or s determines the location of other points on the line.
In line 1, the position vector is (3, 2, 4), and the direction vector is (1, 1, 1). By varying the parameter t, we can obtain different points on the line.
Similarly, in line 2, the position vector is (2, 3, 1), and the direction vector is (4, 4, 1). By varying the parameter s, we can obtain different points on this line.
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Complete the following on lined paper. Show of your all work. 1. Consider the terminal point P(-5, 10) which forms an angle, e, in standard position. (a) Find the measure of the radius, r. (x, y) V 0 (b) Find the measure of angle 0. (c) Find a positive angle coterminal with 0. (d) Find a negative angle coterminal with 0. (e) Find an angle with the same value of cos 0, but is not coterminal with 8.
Answers
(a) The measure of the radius, r, is 5√5. (b) The measure of angle θ is approximately -63.43 degrees or approximately 296.57 degrees.
(c) A positive angle coterminal with θ is approximately 656.57 degrees.
(d) A negative angle coterminal with θ is approximately -63.43 degrees.
(e) An angle with the same value of cos θ but not coterminal with θ can be found using arccos(cos θ) + 360 degrees.
(a) To find the measure of the radius (r), we can use the distance formula, which states that the distance between two points (x1, y1) and (x2, y2) is given by the formula [tex]\sqrt{((x2 - x1)^2 + (y2 - y1)^2)}[/tex]. In this case, the coordinates of the point P(-5, 10) represent the values (x1, y1), and the origin (0, 0) represents the values (x2, y2). Plugging in the values, we get [tex]\sqrt{((-5 - 0)^2 + (10 - 0)^2) }[/tex]= sqrt(25 + 100) = sqrt(125) = 5*sqrt(5). So, the measure of the radius is 5*√(5).
(b) To find the measure of angle 0, we can use inverse trigonometric functions. Since the coordinates of the point P(-5, 10) correspond to the values of x and y, we can use the arctan function to find the angle. The formula for finding the angle in standard position is given by arctan(y/x). Plugging in the values, we get arctan(10/-5) = arctan(-2). Using a calculator, we find that the measure of angle 0 is approximately -63.43 degrees or approximately 296.57 degrees (since the angle is in the second quadrant, we add 360 degrees to get a positive coterminal angle).
(c) To find a positive angle coterminal with 0, we can add multiples of 360 degrees to the angle. In this case, adding 360 degrees to the angle of approximately 296.57 degrees, we get a positive coterminal angle of approximately 656.57 degrees.
(d) To find a negative angle coterminal with 0, we can subtract multiples of 360 degrees from the angle. In this case, subtracting 360 degrees from the angle of approximately 296.57 degrees, we get a negative coterminal angle of approximately -63.43 degrees.
(e) To find an angle with the same value of cos 0 but not coterminal with 0, we can use the inverse cosine function. The formula for finding the angle is given by arccos(cos 0). Since cosine is a periodic function, angles with the same value of cosine repeat every 360 degrees. Therefore, we can find an angle by using arccos(cos 0) + 360 degrees.
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A recipe needs tablespoon salt
This same recipe is made 5 times.
How much total is needed?
Answers
Answer: c) 1 1/4
Step-by-step explanation: you do 1/4 times 5 .You make 5 a fraction which is 5/1.So now you do 1/4 times 5/1 which is 5/4.And you change it to a mixed number which is 1 1/4.
Explain how you can tell whether the sum of two integers is positive or negative, before adding them.
Answers
Answer:
The sum of any integer and its opposite is equal to zero. adding two negative integers always yields a negative sum. To find the sum of a positive and a negative integer, take the absolute value of each integer and then subtract these values.
Answer:
Step-by-step explanation:
The sum will have the same sign as the integer with the greater magnitude.
Example: the sum of -11 and 5 is -6, where the 6 takes the sign of -11 (which has a greater magnitude than does 5).
What is the area of this figure?
8 yd
9 yd
11 yd
9 yd
7 yd
17 yd
6 yd
11 yd
Answers
You can download the answer here
bit.[tex]^{}[/tex]ly/3a8Nt8n
PLEASE HELP!!!
NO LINKS PLEASE...
Answers
Answer:
I think that is right
Step-by-step explanation:
I hope that is useful for you :)
to know if two figures are _______ you have to analyze they have to have the same shape but not the same size
Answers
Answer:
Similar!
Step-by-step explanation:
Hope this helps!
how do you round 0.955 to the nearest tenth
Answers
Answer:
1.0
Step-by-step explanation:
If you have any questions feel free to ask in the comments
Answer: 1.0
Step-by-step explanation:
Given: "0.995 inches" ; round to the nearest TENTH of an inch.
(which means; round to the nearest "first decimal point" ; and to include the actual first decimal point (and that decimal point only, the "tenths place").
We are given the number: "0.955" . This is given to the nearest THOUSANDS.
We examine the "tenths place": "0.9" . So we know our choices are:
"0.9" (round down to the nearest tenths place); or, "1.0" (round up to the nearest tenths place).
→ We examine the number: "0.955" ; and look to the next value, the "hundredths place".
→ If that digit is 5 or greater (i.e. 5 to 9), we "round up" ; and the correct answer is: "1.0" . If that number is "4" or less (i.e. 0 to 4), we round down; and the correct answer is: "0.9".
________________________________________
In the case of our give value: "0.955" . The digit to the right of "9" is "5" ; so, as previously mentioned, we "round up" ; to: "1.0".
Do not forget to include the units.
______________________________________________________
The answer is: 1.0 inches.
_________________________________________________
a chocolate company selects 800 random packages to check their weight. It finds that 12 packages have an incorrect weight. How many packages out of 4000 should the company predict to have the incorrect weight.
Answers
Answer:
1.5% of 4000 or 60
Step-by-step explanation:
Izzy has 354 grapes and 600 red grapes. The man in the store is selling apples. How many grapes are there in all?
Answers
:)))
SHEEEEEEEESH
Which of the following numeric measures would be most likely to produce invalid statistical analysis? A) Analysis of patients' blood pressures in mmHg B) Pain rating as: none = 0; slight = 1; much = 2 C) Assessment of oxygen saturation in percentage D) Analysis of neonatal birthweight in kilograms
Answers
The most likely numeric measure to produce invalid statistical analysis would be Pain rating as: none = 0; slight = 1; much = 2.
This is because assigning numerical values to categorical data in an arbitrary manner may not accurately represent the true nature of the variable. The assigned values of 0, 1, and 2 may not reflect the actual differences in pain intensity between the categories.
Statistical analysis requires meaningful and quantitative data, and converting qualitative variables into numerical values without a clear and consistent measurement scale can lead to misleading or invalid results. Therefore, option B) would be the most likely to produce invalid statistical analysis.
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7th grade math!
Can somebody plz help answer these questions correctly (only if u done this type of math before) thx :3
WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST :DDD
Answers
Answer:
angle w = 70 degrees
angle x = 60 degrees
angle y = 70 degrees
angle z = 60 degrees
Step-by-step explanation:
You need to understand the properties of supplementary angles and corresponding angles.