HELP!!!! I WILL GIVE 65 POINTS!!!!!

A study is designed to determine whether or not taking four years of math in high school helps students' acceptance rate at NC State.


At a certain high school 300 students were not permitted to take a fourth year of math and 300 students were required to take a fourth year of math.

In comparing the acceptance rates of the 600 students at NC State it is noted that the average entrance rate for those who took a fourth year of math is higher than those who took three years of math.

Based on this experiment, guidance counselors began recommending a fourth year of math for college bound students.

Which of the following is false?




a. This design could be improved by randomly assigning 300 students to take a fourth math class and randomly assigning 300 students to take a third math class. Therefore cause and effect could be established.


b. In order to make a better inference for the population instead of taking students from one high school - the researchers could take an SRS from high schools across the state.


c. This design is excellent for establishing cause and effect. Both random assignment and random selection is present.


d. A more meaningful study would be to do an observational study on an SRS of students who have already signed up for a third of fourth year of math.

In Herrnstein's matching equation, the letters and numbers to the left of the equals sign refer to behaviour.

THE MATCHING LAW

Herrnstein's Experiment Herrnstein (1961) conducted an experiment with pigeons in a room with two response buttons, red and white. Each key was assigned its own VI gain schedule. For example, under one condition, the left button pick was boosted on a VI 135 second schedule, and the right button pick was boosted on a VI 270 second schedule.

After the birds have learned as much as possible about this electoral situation, how do they distribute their responses? We trained them for days and then measured their reactions. As is often the case with VI schedules, birds returned many responses for each reinforcer received. Most interesting, however, is that in this condition, where two-thirds of the reinforcers came from the left button, the birds performed about two-thirds of the responses with the left button. That is, the proportion of left button responses equaled or matched the proportion of reinforcers delivered by the left button. In another condition, two birds received only about 15% of reinforcers from the left key and responded about 15% to that key.

Based on these results, Herrnstein proposed the following general principle for individual behavior when presented with alternative sequences. So, what you think makes sense rather than other options available at that particular moment.

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The data described, the number of televisions in different households, is discrete.

discrete data consists of individual values that can be counted and are distinct from one another. In this case, the number of televisions is a discrete variable because it can only take on whole numbers, such as 0, 1, 2, 3, and so on. You cannot have a fractional or continuous number of televisions. Each household will have a specific count of televisions, and there is no intermediate value between each whole number. Additionally, the number of televisions is distinct for each household, meaning that it can differ from one household to another.

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Answer:

\(6(x + 2) > x - 3\)

\(6x + 12 > x - 3\)

\(6x - x > - 12 - 3\)

\(5x > - 9\)

\(3 + 4 \times 2(1 + 2x)\)

\(3 + 8(1 + 2x)\)

\(3 + 8 + 16x\)

\(11 + 16x\)

\( - 2(x + 6)x - 9 < 3(x - 3)\)

\( - 2( {x}^{2} + 6x) - 9 < 3x - 9\)

\( - 2 {x}^{2} - 12x - 9 < 3x - 9\)

According to the question The graphs of the equations intersect at two points: (6, 8) and (-2, 0).

To find the total number of points of intersection between the graphs of the equations \($2x^2 - y^2 = 8$\) and \($y = x + 2$\) , we need to solve the system of equations.

Substituting \($y$\) from the second equation into the first equation, we get:

\(\[2x^2 - (x+2)^2 = 8\]\)

Expanding and simplifying:

\(\[2x^2 - (x^2 + 4x + 4) = 8\]\)

\(\[2x^2 - x^2 - 4x - 4 = 8\]\)

\(\[x^2 - 4x - 12 = 0\]\)

Factoring the quadratic equation, we have:

\(\[(x - 6)(x + 2) = 0\]\)

Setting each factor equal to zero:

\(\[x - 6 = 0 \quad \text{or} \quad x + 2 = 0\]\)

Solving for \($x$\) :

\(\[x = 6 \quad \text{or} \quad x = -2\]\)

Now, substituting these values of \($x$\) back into the equation \($y = x + 2$\)  to find the corresponding \($y$\) values:

When \(\\$x = 6$, $y = 6 + 2 = 8$\).

When \(\\$x = -2$, $y = -2 + 2 = 0$\).

Therefore, the graphs of the equations intersect at two points: (6, 8) and (-2, 0).

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is this a real question cause the awnser is fire

The interquartile range (IQR) for this data set is 1.5.

An interquartile range is a measure of the difference between the upper and lower quartiles of a dataset.

W can find the values of the upper and lower quartile and median from a box plot.

The middle line is the median and the first line is the lower quartile and the last line is the upper quartile.

The formula used is Upper quartile - Lower quartile.

We have,

To find the interquartile range (IQR), we need to first find the first quartile (Q1) and the third quartile (Q3).

To find Q1, we need to find the median of the lower half of the data.

The lower half of the data is:

2, 3, 3, 4, 4

The median of the lower half is (3 + 4) / 2 = 3.5.

Therefore, Q1 = 3.5.

To find Q3, we need to find the median of the upper half of the data.

The upper half of the data is:

4, 4, 4, 5, 5, 6, 7

The median of the upper half is (5 + 5) / 2 = 5.

Therefore, Q3 = 5.

Now that we have Q1 and Q3, we can find the IQR by subtracting Q1 from Q3:

IQR = Q3 - Q1 = 5 - 3.5 = 1.5

Therefore,

The interquartile range (IQR) for this data set is 1.5.

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Answer:

b

basically 5/8 goes to 1/2 0.8 times which is 4/5

(a) Using the given data, we can verify the calculations as follows: ∑x = 245, ∑x^2 = 14,755, ∑y = 224.

(b) To compute the sample mean, variance, and standard deviation for the percentage success of mallard duck nests (x), we use the formulas:

Sample Mean (x) = ∑x / n

Variance (s^2) = (∑x^2 - (n * x^2)) / (n - 1)

Standard Deviation (s) = √(s^2)

(c) Applying the formulas, we can compute the sample mean, variance, and standard deviation for x as follows:

Sample Mean (x) = 245 / 5 = 49

Variance (s^2) = (14,755 - (5 * 49^2)) / (5 - 1) = 4,285

Standard Deviation (s) = √(4,285) ≈ 65.5

Similarly, for the percentage success of Canada goose nests (y), the calculations can be done using the same formulas and the given values from part (a).

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The value of the expression is 1/2, obtained by substituting the values of trigonometric ratios for common angles.

Using the values of trigonometric ratios for common angles, we can simplify the expression as follows:

sin 45 = 1/√2

cosec 90 = 1/sin 90 = 1/1 = 1

cos 0 = 1

tan 60 = √3

Substituting these values, we get:

sin 45 × cosec 90 ÷ √3 cos 0 × tan 60

= (1/√2) × 1 ÷ √3 × 1 × √3

= 1/2

Therefore, the value of the expression is 1/2.

In conclusion, by using the values of trigonometric ratios for common angles, we were able to simplify the given expression and obtain its value as 1/2. This demonstrates the usefulness of trigonometric ratios in simplifying complex expressions and solving problems involving angles and triangles. Understanding the values of trigonometric ratios for common angles is an important aspect of trigonometry and can aid in various applications such as in physics, engineering, and architecture.

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The equation of the parabola in the given graph is:

y = 2(x + 3)² + 1

Remember that for a parabola whose vertex is (h, k) and leading coefficient is a can be written as:

y = a(x - h)² + k

Here we can see that the vertex is at (-3, 1), then we can write:

y = a(x + 3)² + 1

Now, notice that the parabola opens upwards, which means that the leading coefficient must be positive.

From the options, we have only one where the leading coefficient is positive, which is:

y = 2(x + 3)² + 1

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To factor 9x^2 + 24x + 16, we can use the factoring by grouping method.

First, we can find two numbers that multiply to give 9*16=144 and add to give 24. These numbers are 12 and 12.

Next, we can split the middle term 24x into two terms by using these numbers:

9x^2 + 12x + 12x + 16

Now, we can factor out the GCF from the first two terms and the last two terms:

3x(3x + 4) + 4(3x + 4)

Notice that the terms inside the parentheses are the same. We can factor out the common factor (3x+4) from both terms:

(3x+4)(3x+4)

or we can write it in the simplified form:

(3x+4)^2

Therefore, 9x^2 + 24x + 16 can be factored as (3x+4)^2.

Answer:

See below.

Step-by-step explanation:

The density = mass / volume

=  612 / 245

= 2.50 g/cm^3.

The literature  states a density of 2.70 for the density of aluminium. The only other  metal which is close to this value is strontium ( d = 2.64) which is a silvery colour so it might be that.  One way to find out which it i s to see if the metal reacts with water. Aluminium does  not while strontium does.

Answer:

35/32

Step-by-step explanation:

Primero, es necesario hacer el 7 en una fracción

\(\frac{5}{32} * \frac{7}{1}\)

Entonces puede multiplicarse a través

\(\frac{5(7)}{32(1)} \\\\\frac{35}{32}\)

35/32 es la respuesta

¡También, lo siento si mi español es malo! Todavía estoy aprendiendo jaja

Answer:

28x

Step-by-step explanation:

7×3x=21x+x×7=7x

21x+7x×28x

The area enclosed by the curve x = t^2 − 3t, y = √t and the y-axis is 2.08 square units.

We have been given parametric equations x = t^2 − 3t, y = √t

We need to find the area enclosed by the curve x = t^2 − 3t, y = √t and the y-axis.

Consider x = 0

So, t^2 − 3t =  0

t(t - 3) = 0

t = 0   or  t = 3

Let f(t) =  t^2 − 3t and g(t) = t

Differentiate the curve f(t) with respect to t.

f'(t) = 2t - 3

NWe know that the formula to find the area under the curve.

A = ∫[a to b] g(t)f'(t) dt

here, a = 0 and b = 3

so, A = ∫[0 to 3] √t (2t - 3) dt

A = ∫[0 to 3] (2t√t - 3√t) dt

A = ∫[0 to 3] (2t^(3/2) - 3t^(1/2)) dt

A = [4/5 t^(5/2) - 2 t^(3/2)]_[t = 0, t = 3]

A = 4/5 3^(5/2) - 2 3^(3/2) - 0 + 0

A = 4/5 3^(5/2) - 2 3^(3/2)

A = 6√3 /5

A = 2.08

Therefore,  the area of the curve is 2.08 square units.

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In a work cell with 6 machines, an average of 1.17 machines are down. This means that, on average, 4.83 machines are running and contributing to productivity.

In a work cell consisting of 6 machines, the average number of machines that are down is 1.17. This means that, on average, 1.17 machines are not functioning properly or are experiencing downtime at any given time.

When all machines are running, each machine adds its own operational contribution to the Overall productivity of the work cell. However, since the average number of machines down is 1.17, this suggests that not all machines are operating simultaneously.

To calculate the average number of machines running, we subtract the average number of machines down from the total number of machines. In this case, the average number of machines running would be 6 - 1.17 = 4.83.Therefore, when the work cell is operating, on average, 4.83 machines out of the total 6 machines are functioning properly and adding to the overall productivity.

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Let Cesar's, Carmen's and Dalila's amount be represented by x, y and z respectfully.

Since they're money sum up to $95.34, the first expression will be;

x+y+z=95.34

Carmen_y_ is $12.12 less than cesar_x, so the equation will be ;

y=x-12.12

Cesar_x_raised $35more than Dalila_z. So the equation will be;

x=z+35

making z the subject, z=x-35 .

Substituting the Second equation into the first one, we get;

x+x-12.12+z=95.34

Subtracting the third equation into the new equation we get;

x+x-12.12+x-35=95.34

Simplifying, we get 3x- 47.12= 95.34.

3x=142.46

Answer:

-9/4

Step-by-step explanation:

m=(y2-y1)/(x2-x1)

m=(6-15)/(6-2)

m=-9/4

Answer:

$ 204

Step-by-step explanation:

f(x)=8(x-2)

if i did this right then you would substitute 30 in for x------------8 (30-2) - 20

next you would multiply 8 times 30 and 8 times -2 and you would get 240-16-20

then you would subtract and get....................... 204

hope this helps if not then pls know that i tried

Answer: A

Step-by-step explanation:

A. Cleaning windows more often is associated with vacuuming more often. This relationship most likely reflects correlation but not causation because it is possible that these two activities are related, but not necessarily because one causes the other. For example, it is possible that the increased frequency of vacuuming is unrelated to the increased frequency of window cleaning and is actually due to other factors such as the amount of time spent at home.

The statement 'A. Cleaning windows more often is associated with vacuuming more often' most likely represents correlation but not causation, as one activity does not necessarily lead to the other.

The statement 'A. Cleaning windows more often is associated with vacuuming more often' most likely reflects a correlation but not causation. This implies that although the two activities may happen together, one does not necessarily cause the other. For instance, a person could clean the windows without necessarily vacuuming more often.

Whereas, in option B and C, having more dogs and hosting dinner parties could possibly lead to vacuuming more often due to increased dirtiness and cleanliness needs, thus indicating a probable causation.

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Answer:

Step 1: Locate and underline the whole numbers place (2) then look at the digit to the right (6):

2.6

Step 2: In this case, the digit to the right (6) is 5 or above. So, we add 1 to the whole numbers place (2). The digit(s) after the (2) are replaced by zeros (or dropped). Thus, we get 3 as the answer.

In short: 2.6 rounded to the nearest whole number is 3.

Answer:

i think under 3 1/2 its 87.50 and under the 4 its 100

Step-by-step explanation:

for every 1/2 hour he gets $12.50

i hope this is right :)

The denominator of function is -x/2 - 1 and vertical asymptote  x = -2.

A vertical line that is not a part of the function's graph but serves as a guide is known as a vertical asymptote. Because it occurs at an x-value outside of the function's domain, the graph cannot cross it. There may be more than one vertical asymptote for a function.

Given graph

the function of graph is F(x) = \(2\frac{\left(-\frac{x}{2}\ +\ 1\right)}{\left(\frac{x^{2\ }}{4}-1\right)}\) = 2(1- x/2)/(x²/4 - 1)

reducing the equation

F(x) = 2/(-x/2 - 1)

denominator is -x/2 - 1

for  vertical asymptote -x/2 - 1 = 0

x  = -2

Therefore for function is -x/2 - 1 and  vertical asymptote at x  = -2.

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Answer:

see below

Step-by-step explanation:

a) They could be congruent because having the same angles doesn't necessarily mean that they are congruent.

b) These triangles are  congruent by ASA because using the sum of angles in a triangle they have the same angles and one congruent side.

Answer:

a) F

b) C

Step-by-step explanation:

Brainliest please?

For a) it only tells you all the angles, which makes them similar triangles, but none of the sides are given, so it cannot be determined whether they are congruent.

For b) it is not to scale and using a little subtraction, you can quickly use the fact that there are 180 degrees in a triangle, you can determine that the 2 triangles have the same angles, with the side with 9.2 cm between 58 and 68 degree vertices on both triangles, making the 2 triangles congruent by ASA.

QED

Answer:

The answer would be 60 degrees

Step-by-step explanation:

I got the answer from the question after getting it wrong

Answer:

For the first it is dilation by a scale factor of 1.5. For the second it is 6. I think, sorry if they are incorrect.

Step-by-step explanation:

Answer:

8

Step-by-step explanation:

The perimeter is the sum of the 3 sides of the triangle.

let the other 2 sides be x and x - 3 , then

12 + x + x - 3 = 31

2x + 9 = 31 ( subtract 9 from both sides )

2x = 22 ( divide both sides by 2 )

x = 11 and x - 3 = 11 - 3 = 8

The 3 sides are 12, 11, 8

with shortest side 8

The length of the shortest side is 8.

Perimeter of a straight sided figures or objects is the total length of it's boundary.

Given a triangle.

Let a, b and c are the sides of the sides of the triangle, where a is the longest side and the c is the shortest side.

Perimeter of triangle = a + b + c

Perimeter = 31

a = 12

b - c = 3 ⇒ b = 3 + c

We have to find c.

Substituting a = 12 and b = 3 + c in the equation of perimeter,

a + b + c = 31

12 + (3 + c) + c = 31

15 + 2c = 31

2c = 16

c = 8

Hence the length of the shortest side is 8.

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If the adult men have a height with mean as 69 inches , standard deviation as 2.8 inches , then the z-score for 63.4 inches tall man is     .

To find the z-score of a man 63.4 inches tall, we  use the formula: z = (x - μ)/σ  ;

where x is = the individual height, μ is = the mean height, and σ is = the standard deviation.

Substituting the values, we get  ;

⇒ z = (63.4 - 69.0)/2.8  ;

Simplifying, we get:

⇒ z = -5.6/2.8 = -2  .

⇒ z = -2  .

Therefore, the z-score of a man 63.4 inches tall is -2 which means that the man's height is 2 standard deviations below the mean height of adult men.

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The number of negative and positive factors needed to guarantee a negative product with four factors with factors is 10 and there is a pastern

You should understand that the factors of a number is a number which can divide a number without a reminder

The factors must have a constant difference

Taking 1 as a factor for instance

1+5=5

Taking the number 20 for instance

The factors of 20 are

20=1,2,4,5,10,20

-1*20=-20

.1*-20=-20

-2*10=-20 and 2*-10=20

-4*5=-20 and 4*-5=20

The order is that the subsequent terms must be gotten by a difference of 1 and a divisor of 5

Therefore the number of factors is gotten by allocating by after the other a negative sign to the numbers

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