Ethan correctly answers 80% of the total questions on his history test. He correctly answers 32 questions.

Using chi-squared goodness-of-fit test with Benford's Law, observed check frequencies were found to be significantly different, indicating possible fraud. The test statistic was 756.153, exceeding the critical value of 15.51.

Using chi-squared goodness-of-fit test with Benford's Law, observed check frequencies were found to be significantly different, indicating possible fraud. The test statistic was 756.153, exceeding the critical value of 15.51.

To test for goodness-of-fit with Benford's Law, we can use the chi-squared goodness-of-fit test. The null hypothesis is that the observed frequencies follow Benford's Law, while the alternative hypothesis is that they do not.

We can start by calculating the expected frequencies for each leading digit based on Benford's Law. According to Benford's Law, the expected proportion of leading digits is

P(d) = log10(1 + 1/d), where d is the leading digit (1, 2, ..., 9).

Then, we can calculate the expected frequencies by multiplying the proportion by the sample size

Expected frequency for digit d = P(d) * sample size.

Using this formula, we can calculate the expected frequencies for each digit

Expected frequencies: 3.542, 2.019, 1.518, 1.221, 1.028, 0.886, 0.778, 0.697, and 0.643.

We can use these expected frequencies and the observed frequencies to calculate the chi-squared statistic

chi-squared = Σ (observed frequency - expected frequency)² / expected frequency

We can then compare this value to the chi-squared distribution with 8 degrees of freedom (since there are 9 digits and one constraint, which is that the frequencies must add up to the sample size). Using a significance level of 0.05 and a chi-squared distribution table or calculator, the critical value is 15.51.

Plugging in the observed and expected frequencies, we get

chi-squared = (0 - 3.542)²/3.542 + (12 - 2.019)²/2.019 + (0 - 1.518)²/1.518 + (73 - 1.221)²/1.221 + (482 - 1.028)²/1.028 + (186 - 0.886)²/0.886 + (8 - 0.778)²/0.778 + (23 - 0.697)²/0.697 + (0 - 0.643)²/0.643

chi-squared = 756.153

Since the calculated chi-squared statistic (756.153) is greater than the critical value (15.51), we reject the null hypothesis and conclude that the observed frequencies are not consistent with Benford's Law. This suggests that the check amounts are the result of fraud.

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This statement defines the concept of left and right sets of elements x of G with respect to the subgroup H of G.

The left set of x in G, denoted by xH, is the set of all elements of G obtained by multiplying x to the left by all elements of H. Formally xH = {xh: h ∈ H}, where "xh" denotes the product of x and h in G.

Similarly, the right-hand set of x in G, denoted Hx, is the set of all elements of G obtained by multiplying x on the right by all elements of H. Formally Hx = {hx: h ∈ H}, where "hx" denotes the product of h and x in G.

Generally, left and right sets are different sets and may contain different numbers of elements. However, if the group G is commutative (ie the order of multiplication does not matter), then the left and right sets are equal.

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Answer:

y = 3/4x + 15

Step-by-step explanation:

Given;

A line passes through the point (-8, 9) and has a slope of 3/4

Question:

Write an equation in slope-intercept form for this line.​

Solve:

Slope-intercept form ⇒ y=mx+b

Which-

Based on the given;

Using slope intercept form to find y-intercept;

y=mx+b

9 = 3/4(-8) + b

9 = -6 + b

9+6 = -6+6 + b

b = 15

Therefore now we can write an equation.

y = 3/4x + 15

RevyBreeze

Answer: 28.3

Step-by-step explanation:

The question is just asking for the area of a circle with a diameter of 6. The equation for that is [tex]A = \pi r^{2[/tex].

Since the Radius (r) is half the diameter, your equation will look like this: [tex]A=\pi 3^2[/tex].

When plugged into a calculator, 28.27443 is the answer. Rounded to the nearest tenth would be 28.3. Hope this helps!

Answer:

100

Step-by-step explanation:

the room is square this means each wall equal 25 .4 walls *25 =100 square feet

Answer:120

Step-by-step explanation:

the answer to your math problem is 2000

I'm sorry, but I cannot answer this question without additional information about the dimensions of the capsule. Please provide me with the necessary information so that I can assist you.

Answer:

-24√35

Step-by-step explanation:

Mark Brainliest!!

Answer:

16.5 = 6

Step-by-step explanation:

The equation given is (+25)-5x5:2+2² = 27-5×5=2+2². When calculating, we first simplify the division to get (+25)-12.5+4 = 27-25+4. Then we add and subtract the values on either side to get 16.5 = 6. Finally, as the equation is incorrect, we can conclude that the initial assertion is false. It is important to carefully follow the order of operations and simplify expressions correctly to avoid errors in equations.

You need 9 years to buy the car.

Given that, you need to $160,000, you have $58,000, the bank pays 6 % annual interest on its accounts. we need to find the number of years will it be before you have enough to buy the car,

A = P(1+r)ᵇ

102000 = 58000(1+0.06)ᵇ

1.75 = 1.06ᵇ

log 1.75 = b log 1.06

b = 9.6

Hence, you need 9 years to buy the car.

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Answer:

<HAG

Step-by-step explanation:
Two angles are adjacent when they have a common side and common vertex, and they do not overlap one another. In this case, <EAG, A is the vertex. <HAG has the same vertex, A, and it shares side AG.

The Equation based on the function will be: t = (1/0.07) * ln(P/1,500,000)

Initially, the exponential expression is extracted and formulated as follows:

It should be noted that to obtain e^(0.07t) = P/1,500,000

Secondly, in order to determine the value of t, take the natural logarithm of both sides of the equation such that:

Take ln(e^(0.07t)) = ln(P/1500000)

It can now be represented by 0.07t = ln(P/1500000)

Finally, on dividing both components of the term through 0.07, it results in the isolation of t where:

Equation: t = (1/0.07) * ln(P/1,500,000)

In conclusion, this function's inverse describes the number of years, since the year 1990, for a determined population figure, P - its formation being previously outlined above.

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Answer:

A

Step-by-step explanation:

4x - 2y = 8

x - int y = 0

4x = 8

x = 2

(2, 0)

y-int, x = 0

-2y = 8

y = -4

Answer: 75%

Step-by-step explanation:

     We will divide the wanted outcome by the total number of possible outcomes. Note that a decimal times 100 becomes a percentage.

[tex]\displaystyle \frac{\text{not picking a diamond card}}{\text{cards in the deck}} =\frac{39}{\text{52}} =0.75\;\;\;0.75*100=75\%[/tex]

Answer:

90 degrees counterclockwise

Examining the graph, it can be deduced that the graph is not a function.

Domain and range are mathematical notation utilized to define the spectrum of possible accepted input values (domain) as well as the corresponding output values (range) in a given function or relation.

A definitive domain correspondingly denotes the compilations of all plausible inputs that generate a valid result when put essentially into the relation or operation.

Conversely, the range defines the plethora of conceivable outputs that this very same function or relation can devise, considering its specified domain.

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The requried,  Celia made 15 mugs if she had 7.45 lbs of clay left over.

To determine the number of mugs that Celia made, we need to first subtract the weight of the sculpture and the leftover clay from the initial weight of the clay. This will give us the total weight of clay that Celia used for the mugs:

Total weight of clay used for mugs = 40 lbs - 17.4 lbs - 7.45 lbs = 15.29 lbs

Next, we can divide the total weight of clay used for the mugs by the amount of clay used per mug:

Number of mugs = Total weight of clay used for mugs / Amount of clay used per mug

Amount of clay used per mug = 1.01 lbs/mug

A number of mugs = 15.29 lbs / 1.01 lbs/mug = 15.13

Therefore, Celia made 15 mugs.

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The area of the trapezoid with parallel sides of 8 meters and 7 meters, and a height of 4 meters, is 30 square meters.

To find the area of a trapezoid, we use the formula:

Area = (a + b)h/2

where "a" and "b" are the lengths of the parallel sides of the trapezoid, and "h" is the height of the trapezoid.

In this case, we are given that the parallel sides are 8 meters and 7 meters, and the height is 4 meters.

Substituting these values into the formula, we get:

Area = (8 + 7) x 4 / 2

= 15 x 4 / 2

= 60 / 2

= 30 square meters

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The given images shows us that we have a total of two lines

In mathematics, a point is referred to as the particular location on a plane. A point is identified by a dot.  It has no length, shape or size.

A line is straight, without any type of thickness and it is the shortest distance that exists between 2 points. It has only length. It is without width.

A line segment has two end points. The difference that a line segment has with a line is that a line is extensive while the line segment has two end points.

Ray is defined as a line that has only one endpoint. The other end of the line just goes on. It has one start point and one end point.

From the attached image, it is vert clear that we have two lines which are the horizontal line and the line that divides it.

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The sketches of the graphs are added as an attachment and the gradient of the perpendicular line l₂ is 1

Given that

3x + 4y + 12 = 0

Set x = 0 to determine the y-intercept

4y + 12 = 0

So, we have

y-intercept = -3

Set y = 0 to determine the x-intercept

3x + 12 = 0

So, we have

x-intercept = -4

For the gradient, we make y the subject in 3x + 4y + 12 = 0.

y = -3/4x - 12/4

y = -3/4x - 3

So, the gradient is -3/4

The sketch of the graph is attached.

Here, we have the points P (-1,4) and Q (3,0).

The gradient is

gradient = (0 - 4)/(3 + 1)

gradient = -1

From the point, we have

x-intercept = 3

For the y-intercept, we have

(0 - 4)/(3 + 1) = (y - 4)/(0 + 1)

(y - 4)/(0 + 1) = -1

y - 4 = -1

y-intercept = 3

So, the equation is

y = -x + 3

The sketch of the graph is attached.

We understand that l₂ is perpendicular to l

The gradients of perpendicular lines are

Gradient 1 = -1/Gradient 2

So, we have

l₂ = -1/-1

Evaluate

l₂ = 1

Hence, the gradient of line l₂ is 1

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Answer:

  2035.8 ft³

Step-by-step explanation:

You want to know the volume of a cylinder with radius 6 ft and height 18 ft.

The volume of a cylinder is given by the formula ...

  V = πr²h

For the given dimensions, the volume is ...

  V = π(6 ft)²(18 ft) ≈ 2035.8 ft³

The volume of the cylinder is about 2035.8 cubic feet.

__

Additional comment

If you use 3.14 for π, you get 2034.7 cubic feet.

<95141404393>

The value of x in the triangle is 12.285.

We have,

We use cosine identities.

So,

Cos Ф = Base / Hypotenuse

Now,

Cos 35= x/15

0.819 = x/15

x = 0.819 x 15

x = 12.285

Thus,

The value of x is 12.285.

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Answer:

there are no choices given but...

Step-by-step explanation:

this simplifies to 8/3, or 2 2/3

find the choice that isn't either of those ( is also 2.66666 repeating)

The point after a dilation by a scale factor of 2 with the origin as the center of dilation, and a translation over the y-axis is (-16, 2).

Given is a point, (8, 1) we need to find the coordinates of a point which is dilated from the origin by the scale factor of 2 and translation over the y-axis,

So, the coordinates of after dilation by k scale factor =

(x, y) = (kx, ky)

So, (8, 1) = (16, 2)

Now, the translation over the y-axis gives,

(x, y) = (-x, y)

Therefore, (16, 2) = (-16, 2)

Hence, the point after a dilation by a scale factor of 2 with the origin as the center of dilation, and a translation over the y-axis is (-16, 2).

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a) The exponential growth function for a city's population that was 6.53 million in 2012 with an exponential growth rate of 2.79% per year is y = 6.53(1.0279)^t.

b) Based on the exponential growth function y = 6.53(1.0279)^t the population of the city in 2018 is 7.7 million.

c) The population of the city will be 10 million in 2028.

d) The doubling time for the population is 25 years.

An exponential growth function is one of the two exponential functions, including an exponential decay function.

An exponential growth function shows the relationship between two variables with an exponent and exhibits a constant rate of growth per period.

Population of the city in 2012 = 6.53million

Exponential growth rate = 2.79% per year

Let the number of growth years = t

a) y = 6.53(1.0279)^t

b) From 2012 to 2018, the number of years = 6 years

Population in 2018, y = 6.53(1.0279)^6

= 7.7 million

c) When the population will be 10 million = 15.5 years

10 = 6.53(1.0279)t

t = 15.5 years

= 16 years

= 2028

d) 13.06 = 6.53(1.0279)t

t = 25.189 years

= 25 years

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The value of length of AG is,

AG = 157.02

We have to given that;

AD = 31 cm

DC = 22 cm

Hence, We get;

AC = √31² + 22²

AC = √961 + 484

AC = √1445

AC = 38

Thus, We get;

cos 76° = AC / AG

0.242 = 38 / AG

AG = 38/0.242

AG = 157.02

Therefore, The value of length of AG is,

AG = 157.02

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Based on the information, we cannot reject the null hypothesis because our calculated phi coefficient (0.245) is smaller than the critical value (3.84).

It should be noted that to establish whether the phi coefficient is statistically significant, we can compare it to a crucial value. However, the significance level (i.e., alpha) must be specified ahead of time.

Assume a 0.05 level of significance. We calculate the crucial value for a 2x2 contingency table with 1 degree of freedom and a significance level of 0.05 using a phi coefficient table or calculator.

We cannot reject the null hypothesis because our calculated phi coefficient (0.245) is smaller than the critical value (3.84). As a result, we find that there is no statistically significant relationship between the therapist's method and client satisfaction.

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The surface area of the composite figure is about 98.56 sq.cm

The composite figure is made up of a cylinder and a cuboid.

The formula for surface area of a cylinder is:

A = 2πr² + 2πrh

In this case, we only have top and not bottom. Thus:

A = πr² + 2πrh

A = π(1)² + 2π(1 * 6)

A = 37.7 sq.cm

Surface area of cuboid is:

A = 2(4 * 4) + 4(2 * 4) - π(1)²

A = 32 + 32 - π

A = 60.86 sq.cm

Total surface area = 37.7 sq.cm + 60.86 sq.cm

= 98.56 sq.cm

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The equation 2x² - 7x - 30 = 0 has two solutions: x = -5/2 and x = 6 and both solutions are real.

Given the equation in the question:

2x² - 7x - 30 = 0

We can use the quadratic formula to to determine the number and type of solutions :

x = (-b±√(b² - 4ac)) / (2a)

2x² - 7x - 30 = 0

a = 2

b = -7

c = -30

Plugging in these values, we get:

x = (-b±√(b² - 4ac)) / (2a)

x = (-(-7) ± √((-7)² - ( 4 × 2 × -30))) / (2×2)

x = (7 ± √( 49 - ( -240))) / (4)

x = (7 ± √( 49 + 240)) / (4)

x = (7 ± √( 289)) / (4)

x = (7 ± 17) / 4

x = (7 - 17) / 4 and x = (7 + 17) / 4

x = -5/2 and x = 6

Therefore, the two solutions are x = -5/2 and x = 6.

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