Solve for the variable.
pls help me​

Rounding to two decimal places, the obtained chi-square statistic is 6.67.

We can use the chi-square goodness-of-fit test to determine if there is a significant difference in the preference for class format. We need to calculate the expected frequencies under the assumption that all groups have an equal preference. The total sample size is 90, so each group would be expected to have 30 students.

Observed frequencies:

Online: 50

In-person: 18

Hybrid: 22

Expected frequencies:

Online: 30

In-person: 30

Hybrid: 30

We can use the chi-square formula to calculate the test statistic:

χ^2 = Σ [(O - E)^2 / E]

where Σ is the sum of all the cells, O is the observed frequency, E is the expected frequency.

Plugging in the values:

χ^2 = [(50 - 30)^2 / 30] + [(18 - 30)^2 / 30] + [(22 - 30)^2 / 30]

χ^2 = 6.67

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14 out of 40 marigold seeds , 18 out of 50 zinnia seeds ,  12 out of 30 sunflower seeds  are the names of the plants in the order from least percentage to greatest percentage of the plants that grew

What is percentage?

There is no dimension to percentages. As a result, it is known as a dimensionless number. When we say a number is 50% of anything, we imply that it is 50% of everything.

As in 0.6%, 0.25%, etc., percentages can also be expressed as decimals or fractions. The grades earned in any topic are calculated in terms of percentages in academics. Ram, for instance, scored 78% in his final test. This percentage is derived based on Ram's overall grade point average (GPA) across all disciplines.

10% is equivalent to a fraction of one.

20% is equal to a 1/5 fraction.

25% is equal to a 1/4 fraction.

50% is equal to a 1/2 fraction.

75% is equal to a 1/4 fraction.

90% is equal to a fraction of 9/10.

14 out of 40 marigold seeds = 14/40 x 100 = 35%

18 out of 50 zinnia seeds = 18/50 x 100 = 36%

12 out of 30 sunflower seeds = 12/30 x 100 =40%

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The distribution used is F-distribution for the test statistic corresponding to the given joint test will be F(4, 582).

The regression 1 and its specification is dependent variable is birthweight and independent variables are alcohol, tripre1, tripre2, tripre3, unmarried, educ, and age.

The hypothesis is testing for joint null hypothesis, as stated below, that is

H0: βalcohol = βunmarried

H0: βtripre2 = βunmarried

H0: βtripre1 = βtripre3

H0: βeduc = βage

Against the alternative that at least one of these conditions does not hold.

The formula for the F-distribution is:

F = (SSR1 – SSR2 / r) / SSE2 / (n – r – 1)

Where,

SSR1: Residual sum of squares for the full model

SSR2: Residual sum of squares for the reduced model

r: Number of restrictions

SSE2: Residual sum of squares for the reduced model

n: Sample size

Given the sample size, Regression 1's specification, and the joint test, the distribution of the test statistic corresponding to this joint test will be F(4, 582). Hence, the correct option is F(4, 582).

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The fundamental question addressed by the correlational method is whether two or more variables are related in some systematic way. So the correct option is D.

Correlational method is a research technique used to explore the relationship between two or more variables. In this method, researchers collect data on the variables of interest and analyze their patterns of association. The fundamental question addressed by the correlational method is whether two or more variables are related in some systematic way. This means that researchers are interested in exploring whether changes in one variable are associated with changes in another variable.

For instance, a researcher may be interested in exploring the relationship between stress and job performance. The researcher may collect data on the levels of stress and job performance in a sample of employees and then use statistical analysis to determine if there is a systematic relationship between the two variables. If the results show that higher levels of stress are associated with lower levels of job performance, then the researcher can conclude that there is a negative correlation between the two variables.

It is important to note that correlation does not imply causation. While a correlation between two variables indicates that they are related, it does not necessarily mean that changes in one variable are causing changes in the other variable. Therefore, researchers must be cautious when interpreting correlational data and should consider other factors that may be influencing the relationship between variables.

Therefore, the fundamental question addressed by the correlational method is whether two or more variables are related in some systematic way, and researchers must be cautious when interpreting correlational data and should consider other factors that may be influencing the relationship between variables.

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Answer:

Hello thanks for the question, if my answqers are correcrt pls mark brain liest  

1. 56 n − 35

2. − 40 p + 13

3. − 77 k − 40

Step-by-step explanation:

Answer:

the answer is A

Step-by-step explanation:

Answer:

x=8

Step-by-step explanation:

Solution. To graph f, we graph the equation y=f(x).

To this end, we use the techniques outlined in Section 1.2.1. Specifically, we check for intercepts, test for symmetry, and plot additional points as needed. To find the x -intercepts, we set y=0. Since y=f(x), this means f(x)=0.

\($$\begin{aligned}f(x) & =x^2-x-6 \\0 & =x^2-x-6 \\0 & =(x-3)(x+2) \quad \text { factor } \\x-3=0 & \text { or } x+2=0 \\x & =-2,3\end{aligned}$$\)

So we get (-2,0) and (3,0) as x-intercepts. To find the y-intercept, we set x=0. Using function notation, this is the same as finding f(0) and f(0)=0^2-0-6=-6. Thus the y-intercept is (0,-6). As far as symmetry is concerned, we can tell from the intercepts that the graph possesses none of the three symmetries discussed thus far. (You should verify this.) We can make a table analogous to the ones we made in Section 1.2.1, plot the points and connect the dots in a somewhat pleasing fashion to get the graph below on the right.

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Answer:

$25.08

Step-by-step explanation:

(the extra dollar signs aren't necessary)

All you have to do is 225.72 divided by 9 to find how much she makes per hour.

\(\frac{225.72}{9} = 25.08\) is the amount she makes per hour.

The estimation of 0.000007328 is \(7\times10^{-6\).

Estimation is he ability to guess the amount of anything without actual measurement.

The number (n) is given as:

\(\text{n}=0.000007328\)

Multiply by 1

\(\text{n}=0.000007328\times1\)

The number is to be rounded to the nearest millionth.

So, we substitute \(\frac{1000000}{1000000}\) for 1

\(\text{n}=0.000007328\times1\)

\(\text{n}=0.000007328\times\dfrac{1000000}{1000000}\)

This becomes

\(\text{n}=7.328\times\dfrac{1}{1000000}\)

Express the fraction as a power of 10

\(\text{n}=7.328\times10^{-6\)

Approximate to a single digit

\(\rightarrow\bold{n=7\times10^{-6}}\)

Therefore, the estimation of 0.000007328 is \(7\times10^{-6}\).

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The width of the new rectangular field would be 0 meters, which means it would essentially be a line segment.

To find the length and width of another rectangular field that has the same perimeter but a larger area, we can use the following steps:

1. Calculate the perimeter of the given rectangular field:

  Perimeter = 2 * (Length + Width)

            = 2 * (120 meters + 80 meters)

            = 2 * 200 meters

            = 400 meters

2. Divide the perimeter by 2 to find the equal sides of the new rectangular field. Since the perimeter is divided equally into two sides, each side would be half of the perimeter length:

  Side length = Perimeter / 2

             = 400 meters / 2

             = 200 meters

3. Now, we have the side length of the new rectangular field. However, we need to determine the length and width that would yield a larger area. One way to achieve this is to make one side longer and the other side shorter.

4. Let's assume the length of the new rectangular field is 200 meters. Since both sides have the same length, the width can be calculated using the formula for the perimeter:

  Width = Perimeter / 2 - Length

        = 400 meters / 2 - 200 meters

        = 200 meters - 200 meters

        = 0 meters

5. Therefore, the width of the new rectangular field would be 0 meters, which means it would essentially be a line segment. However, note that the question asks for a rectangular field with a larger area. Since the width cannot be zero, we can conclude that it is not possible to have a rectangular field with the same perimeter but a larger area than the given field.

In summary, it is not possible to find another rectangular field with the same perimeter but a larger area than the rectangular field with dimensions 80 meters wide and 120 meters long.

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Answer:

72 ounces

Step-by-step explanation:

1 pint = 16 ounces

4.5 pints* 16 ounces = 72 ounces

*4.5=4 1/2

A plot of the residuals of the regression versus the dose can reveal the following information:

1. Pattern of Residuals: It can help identify any systematic patterns in the residuals, such as a linear trend, curvature, or clustering around specific dose values. This can indicate whether the linear regression model is appropriate for the data or if there are non-linear relationships that need to be considered.

2. Homoscedasticity: It can show whether the variability of the residuals is constant across different levels of the dose. If the spread of the residuals remains roughly constant as the dose changes, it suggests that the assumption of homoscedasticity is met. However, if the spread of the residuals widens or narrows as the dose increases or decreases, it indicates heteroscedasticity, which may require additional model adjustments.

3. Outliers: Residual plots can help identify any extreme values or outliers in the data. Outliers are data points that do not follow the general trend of the data and can significantly impact the regression model's performance. A plot of residuals can visually highlight any unusual or influential observations that need further investigation.

4. Independence of Errors: A random pattern in the residuals indicates that the errors or residuals are independent of each other. If a clear pattern or structure is observed in the residuals, it suggests that there may be some correlation or systematic error present in the model.

Overall, a plot of the residuals can provide valuable insights into the goodness of fit of the regression model, the presence of any outliers or influential observations, and the assumptions underlying the regression analysis.

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Answer:

x:5,x:7

x^2-12x+35

x^2-12x=-35

x^2-12x+6^2=-35+36

(x+6)^2=1

insert a radical anywhere

x+6=1

x=1-6

x=-5. x=5

x=-1-6

x=-7. x=7

Answer:

Step-by-step explanation:

See attached for answer options

As per the table, the points are:

This is linear function and the formula is:

So the function is

The correct answer options attached

The property of real numbers illustrated by the given equation 2.3(3.4 . 12.9)=(2.3 . 3.4)(12.9)  is the associative property of multiplication.

1. The equation states that 2.3 multiplied by the product of 3.4 and 12.9 is equal to the product of 2.3 and 3.4, multiplied by 12.9.
2. According to the associative property of multiplication, when multiplying three or more real numbers, it doesn't matter which two numbers are multiplied first. The product will remain the same.
3. In this case, we can first multiply 3.4 and 12.9, then multiply the result by 2.3, or we can first multiply 2.3 and 3.4, then multiply the result by 12.9. The answer will be the same either way.
This property is useful in simplifying complex multiplication expressions and allows us to rearrange the order of multiplication to make calculations more efficient.

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Answer:

Step-by-step explanation:

If you translate the triangle BCD in such a way that vertex B maps onto vertex W, you'll realize that with rotation, you'll map the whole BCD triangle onto triangle WXY.

On the other hand, reflections can't be used here, because the sides of both triangles are not in opposite positions.

Therefore, the right answer is the third choice.

75 miles

if u do 15x5 you will get 75 and that's how many miles you will get

Answer:

the fourth mark after 2 inches

Step-by-step explanation:

each tile measures 2.23607 inches long

That means that the mark will be 2 inches and somewhere in between the third and fourth mark. The third mark is equivalent to 0.1875 inches and the fourth mark is equivalent to 0.25 inches. The mark closest to the actual length of the tile would be the fourth mark after 2 inches.

each mark represents 1 / 16 = 0.0625 inches, if we divide 0.23607 by 0.0625 = 3.69072 marks which we can round to 4 marks

Answer:

ans: -4( x-3 )( x-4 ) I.e -4( x² + x - 12 )

Step-by-step explanation:

as per question

1- (2x-7)²

= (1 + 2x - 7)(1- 2x + 7)

= ( 2x - 6)(-2x +8)

= -4(x-3)(x+4)

The simplified form of \((2x-7)^{2}\) is \(4x^{2} +49-28x\).

And we get, \(-4x^{2} -48+28x\) when we subtract \((2x-7)^{2}\) from 1.

Polynomials are algebraic expressions that consist of variables and coefficients.

\((a-b)^{2} =a^{2} +b^{2} -2ab\)

According to the given question

We have a polynomial \((2x -7)^{2}\).

Therefore, the simplified form of \((2x-7)^{2}\) is given by

\((2x-7)^{2} =(2x)^{2} +(7)^{2} -2(2x)(7)\)

⇒\((2x-7)^{2} =4x^{2} +49-28x\)

Therefore, the simplified form of \((2x-7)^{2}\) is \(4x^{2} +49-28x\).

Now,

\(1-(4x^{2} +49-28x)= 1-4x^{2} -49+28x\)

⇒\(1-(4x^{2} +49-28x)=-4x^{2} -48+28x\)

Hence, we get \(-4x^{2} -48+28x\) when we subtract \((2x-7)^{2}\) from 1.

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It is important for scientists to use all of their results because selective reporting can lead to biased or incomplete conclusions. Including all results helps ensure objectivity and transparency in scientific findings.

When the evidence neither supports nor contradicts the hypothesis, it is crucial for scientists to acknowledge and report this outcome. It indicates the need for further investigation and can contribute to the accumulation of knowledge. Scientists should explore alternative explanations, refine their hypotheses, or modify their experimental approaches to gain a deeper understanding of the phenomenon.

Scientists repeating each other's experiments serves as a vital aspect of the scientific process called replication. Replication helps validate or challenge previous findings, ensures the reliability of results, and identifies any potential errors or biases. It enhances the overall credibility and robustness of scientific knowledge by promoting consensus and reducing the likelihood of false or misleading conclusions.

Regarding whether there is any scientific knowledge that it would be better not to have, it is a complex question. Generally, scientific knowledge empowers humanity by expanding our understanding of the world and driving progress. However, ethical considerations may arise in certain areas, such as knowledge that could be weaponized or have harmful consequences if misused. Responsible dissemination and application of scientific knowledge, along with ethical frameworks, help ensure the benefits outweigh the potential risks.

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Answer:

28

Step-by-step explanation:

The answer should be 28.

Answer:

How is genetic information passed from parents to offspring in humans?

But when people talk about genes being passed on, they generally don't mean genes being passed on from cell to cell during cell division. Instead, they usually mean genes being passed on from parents to children. This is known as "heredity" or "inherited genes."

Step-by-step explanation:

Answer:

301.7 cm

Step-by-step explanation:

Given,

Height of cone (h)=8cm

base radius (r)=6cm

Volume of the cone (V)=

3

1

πr

2

h

=

3

1

×

7

22

×6×6×8

=

7

2112

=301.7cm

3

Hence, volume of the cone =301.7cm

3

Answer:

402.1402.1 cm

Step-by-step explanation

height = 6cm

Radius= 8cm

The sampling technique used to obtain the described sample is A. Systematic sampling.

In systematic sampling, the elements of the population are ordered in some way, and then a starting point is randomly selected. From that point, every nth element is selected to be part of the sample.

In the given scenario, the first 35 students leaving the library were selected. This suggests that the students were ordered in some manner, and a systematic approach was used to select every nth student. Therefore, the sampling technique used is systematic sampling.

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Answer:

6/5

Step-by-step explanation:

Answer:

Step-by-step explanation:

\(\dfrac{3}{5}\)   ÷ \(\dfrac{1}{2}\)

\(=\dfrac{3}{5}*\dfrac{2}{1}\\\\=\dfrac{6}{5}\\\\\\=1\dfrac{1}{5}\)

Answer:

Solving equations requires a systematic approach, attention to detail, and understanding of the underlying principles.

If you attempted the problem four times and all recorded scores were 0%, it suggests that your attempts did not yield the correct solution. To solve the equation t = r + 7kw, we need to have specific values or information about the variables involved. Without any additional details, it is not possible to provide a numerical solution.

To improve your chances of solving the equation successfully, consider the following steps:

Review the equation: Make sure you understand the structure and the relationship between the variables. In this case, t is equal to the sum of r and 7 times the product of k and w.

Check for errors: Review your calculations and ensure there are no mistakes in your algebraic manipulations. Double-check your arithmetic operations and signs.

Seek assistance: If you're having difficulty solving the equation, consider reaching out for help. Consult a teacher, tutor, or someone knowledgeable in the subject matter. They can guide you through the problem-solving process and clarify any misunderstandings.

Practice and persistence: Continue practicing similar equations to improve your problem-solving skills. Persistence and practice are key to mastering mathematical concepts.

Remember, solving equations requires a systematic approach, attention to detail, and understanding of the underlying principles. Keep practicing and seeking assistance, and you will improve your problem-solving abilities over time.

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Answer:

Solving equations requires a systematic approach, attention to detail, and understanding of the underlying principles.

If you attempted the problem four times and all recorded scores were 0%, it suggests that your attempts did not yield the correct solution. To solve the equation t = r + 7kw, we need to have specific values or information about the variables involved. Without any additional details, it is not possible to provide a numerical solution.

To improve your chances of solving the equation successfully, consider the following steps:

Review the equation: Make sure you understand the structure and the relationship between the variables. In this case, t is equal to the sum of r and 7 times the product of k and w.

Check for errors: Review your calculations and ensure there are no mistakes in your algebraic manipulations. Double-check your arithmetic operations and signs.

Seek assistance: If you're having difficulty solving the equation, consider reaching out for help. Consult a teacher, tutor, or someone knowledgeable in the subject matter. They can guide you through the problem-solving process and clarify any misunderstandings.

Practice and persistence: Continue practicing similar equations to improve your problem-solving skills. Persistence and practice are key to mastering mathematical concepts.

Remember, solving equations requires a systematic approach, attention to detail, and understanding of the underlying principles. Keep practicing and seeking assistance, and you will improve your problem-solving abilities over time.

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In order to determine which of the potential employees should be offered the job, we need to compare their scores in relation to the mean and standard deviation of their respective versions of the aptitude test.

Vincent scored 83.5 on his version of the test, which has a mean of 68.2 and a standard deviation of 9. This means that Vincent's score is 1.72 standard deviations above the mean (z-score = (83.5-68.2)/9).
Kaitlyn scored 251.2 on her version of the test, which has a mean of 238 and a standard deviation of 22. This means that Kaitlyn's score is 0.6 standard deviations above the mean (z-score = (251.2-238)/22).

Reyna scored 8.04 on her version of the test, which has a mean of 7.2 and a standard deviation of 0.7. This means that Reyna's score is 1.2 standard deviations above the mean (z-score = (8.04-7.2)/0.7).
Based on these calculations, it is clear that Kaitlyn performed the best on the aptitude test, as her score was the furthest above the mean in terms of standard deviations. Therefore, if the company prefers to fill the position with the applicant who performed best on the aptitude test, Kaitlyn should be offered the job.

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The number of people who must be included in the survey, that is, the sample size should be 340.

We assume the sample size to be n.

The confidence interval required is 99%.

The Z-score corresponding to the 99% confidence interval is (Z) 2.58.

The true proportion (p) of the sample is not given, so we assume it to be 50% or 0.5.

The margin of error for the sample (E) is given to be 7% or 0.07.

By the formula of margin of error, we know that:

E = Z√[{p(1 - p)}/n].

Putting in the values, we have, we get:

0.07 = 2.58√[{0.5*0.5}/n],

or, (0.07/2.58)² = 0.25/n,

or, n = 0.25/{(0.07/2.58)²} = 339.6122449 ≈ 340.

Thus, the number of people who must be included in the survey, that is, the sample size should be 340.

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Answer:

12

Step-by-step explanation:

Answer:

1) 12 boxes

2) 3, 6, 12

3) 12

4) 110 degrees

Step-by-step explanation:

1) Count the rectangles. Multiply the length of the rectangle in boxes to the width of rectangle in boxes.

Length: 4 boxes

Width: 3 boxes

4 x 3 = 12

12 boxes

2)

10% of 30 is 0.1 times 30.

0.1 x 30 = 30/10 = 3

20% of 30 is 0.2 times 20.

0.2 x 30 = 30/5 = 6

40% of 30 is 0.4 times 20.

0.4 x 30 = 30/2.5 = 12

3) Count the cubes. Reminder there are 2 boxes you cannot see.

Top Layer: 2

Middle Layer: 4

Back Bottom Layer: 4

Front Bottom Layer: 2

2 + 4 + 4 + 2 = 12

4) I cannot see the semicircle clearly, but I do know that a circle is 360 degrees. A semicircle, half of a circle, is 180 degrees.

180/18 (The angle of each section)

10

11 Sections

10 x 11 = 110