Consider a hypothesis test to decide whether the mean annual consumption of beer in the nation's capital is less than the national mean. Answer the following questions.

1. "The mean annual consumption of beer in the nation's captial is less than the national mean and the result of the hypothesis test does not lead to the conclusion that the mean annual consumption of beer in the nation's capital is less than the national mean" is a:________

a. Correct decision
b. Type II error
c. Type I error

2. "The mean annual consumption of beer in the nation's captial is less than the national mean and the result of the sampling leads to the conclusion that the mean annul consumption of beer in the nation's capital is less than the national mean" is a:_________

a. Correct decision
b. Type II error
c. Type I error

3. "The mean annual consumption of beer in the nation's captial is less than the national mean but the result of the sampling does not lead to the conclusion that the mean annual consumption of beer in the nation's capital is less than the national mean" is a:________

4. Correct decision
b. Type II error
c. Type I error

d. "The mean annual consumption of beer in the nation's captial is not less than the national mean and the result of the sampling does not lead to the conclusion that the mean annual consumption of beer in the nation's capital is less than the national mean" is a:________

a. Correct decision
b. Type II error
c. Type I error

Answer:

[tex]V = \frac{2L\sqrt{3}}{3} \pi}[/tex]

[tex]A = 4\pi + \sqrt{3L^{2} + 16}[/tex]

Step-by-step explanation:

Figure of cone is missing. See attachment

Given

Radius, R = 2m

Let L = KL=LM=KM

Required:

Volume, V and Surface Area, A

Calculating Volume

Volume is calculated using the following formula

[tex]V = \frac{1}{3} \pi R^{2} H[/tex]

Where R is the radius of the cone and H is the height

First, we need to determine the height of the cone

The height is represented by length OL

It is given that KL=LM=KM in triangle KLM

This means that this triangle is an equilateral triangle

where OM = OK = [tex]\frac{1}{2} KL[/tex]

OK = [tex]\frac{1}{2}L[/tex]

Applying pythagoras theorem in triangle LOM,

|LM|² =  |OL|² + |OM|²

By substitution

L² = H² + ( [tex]\frac{1}{2}L[/tex])²

H² = L² -  [tex]\frac{1}{4}L[/tex]²

H² = L² (1 -  [tex]\frac{1}{4}[/tex])

H² = L² [tex]\frac{3}{4}[/tex]

H² = [tex]\frac{3L^{2} }{4}[/tex]

Take square root of bot sides

[tex]H = \sqrt{\frac{3L^{2} }{4}}[/tex]

[tex]H = \frac{L\sqrt{3}}{2}[/tex]

Recall that [tex]V = \frac{1}{3} \pi R^{2} H[/tex]

[tex]V = \frac{1}{3} \pi 2^{2} * \frac{L\sqrt{3}}{2}[/tex]

[tex]V = \frac{1}{3} \pi * 4} * \frac{L\sqrt{3}}{2}[/tex]

[tex]V = \frac{1}{3} \pi} * {2L\sqrt{3}}[/tex]

[tex]V = \frac{2L\sqrt{3}}{3} \pi}[/tex]

in terms of [tex]\pi[/tex] an d L where L = KL = LM = KM

Calculating Surface Area

Surface Area is calculated using the following formula

[tex]H = \frac{L\sqrt{3}}{4}[/tex]

[tex]A=\pi r(r+\sqrt{h^{2} +r^{2} } )[/tex]

[tex]A=\pi * 2(2+\sqrt{((\frac{L\sqrt{3}}{2})^{2} +2^{2} } )[/tex])

[tex]A=\pi * 2(2+\sqrt{{\frac{3L^{2}}{4} } + 4 }[/tex] )

[tex]A=\pi * 2(2+\sqrt{{\frac{3L^{2}+16}{4} } })[/tex]

[tex]A=2\pi(2+\sqrt{{\frac{3L^{2}+16}{4} } })[/tex]

[tex]A = 2\pi (2 + \frac{\sqrt{3L^{2} + 16}}{\sqrt{4}} )[/tex]

[tex]A = 2\pi (2 + \frac{\sqrt{3L^{2} + 16}}{2} )[/tex]

[tex]A = 2\pi (2 + {\frac{1}{2} \sqrt{3L^{2} + 16})[/tex]

[tex]A = 4\pi + \sqrt{3L^{2} + 16}[/tex]

Final answer:

To calculate a 95% confidence interval for the true average CO2 level in the population of all homes, we use the sample mean and sample standard deviation to calculate the margin of error and determine the lower and upper bounds of the confidence interval.

Explanation:

To calculate a 95% confidence interval for the true average CO2 level in the population of all homes, we can use the sample mean and sample standard deviation provided.

First, we calculate the margin of error using the formula: Margin of Error = Critical Value x (Sample Standard Deviation / sqrt(Sample Size)). The critical value for a 95% confidence interval is 1.96.

Next, we calculate the lower and upper bounds of the confidence interval by subtracting and adding the margin of error to the sample mean respectively.

Therefore, the 95% confidence interval for the true average CO2 level in the population of all homes is (589.17, 719.15).

This means that we can be 95% confident that the true average CO2 level in the population of all homes falls within this range.

Answer:

Unknown 1: -OH group at 3400-3600

Unknown 2: Ketone and alkene group

Step-by-step explanation:

Unknown 1:

This compound has a strong IR absorption at 3400 - 3600cm-¹; this indicates that it is an alcoholic group (OH)

No absorption between 1600 and 2900cm-¹: this rule out the presence of ketone (C = O)

Hence the unknown compound is OH group

Unknown 2:

This has strong IR absorption at 1680cm-¹: this indicates the presence of (C=O) group.

No absorptions above 3100cm-¹: this indicates the presence of C = C - H

So therefore, unknown 2 is most likely to be Ketone and alkene group

Answer:

See down below.

Step-by-step explanation:

Theoretical probability is what we expect to happen. For example, we do a test of flipping a coin. You know that its either gonna be heads or tails.

Experimental probability is what actually happens when we try it out. It occurs when we are doing an experiment and then something happens.

Hope this helps!

Theoretical probability is calculated based on assumptions and mathematical calculations, while experimental probability is based on actual data and observations.

Theoretical probability is calculated by dividing the number of favorable outcomes by the total number of possible outcomes. It is based on assumptions and mathematical calculations. For example, if you flip a fair coin, the theoretical probability of getting heads is 1 out of 2, or 0.5.

Experimental probability, on the other hand, is calculated by conducting an actual experiment and observing the outcomes. It is based on actual data and observations. For example, if you flip a coin 10 times and get heads 6 times, the experimental probability of getting heads is 6 out of 10, or 0.6.

In summary, theoretical probability is based on calculations and assumptions, while experimental probability is based on actual data and observations.

Answer:

Wag

Step-by-step explanation:

C72 или Wag ладно помогите

Answer:

[tex]n=(\frac{2.58(1.2)}{0.25})^2 =153.36 \approx 154[/tex]

So the answer for this case would be n=154 rounded up to the nearest integer

Step-by-step explanation:

Assuming the following question: It is desired to estimate the mean GPA of each undergraduate class at a large university. How large a sample is necessary to estimate the GPA within 0.25 at the 99% confidence level? The population standard deviation is 1.2. If needed, round your final answer up to the next whole number.

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

[tex]\bar X[/tex] represent the sample mean for the sample  

[tex]\mu[/tex] population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

Solution to the problem

The margin of error is given by this formula:

[tex] ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}[/tex]    (a)

And on this case we have that ME =0.25 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

[tex]n=(\frac{z_{\alpha/2} \sigma}{ME})^2[/tex]   (b)

The critical value for 99% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.005;0;1)", and we got [tex]z_{\alpha/2}=2.58[/tex], replacing into formula (b) we got:

[tex]n=(\frac{2.58(1.2)}{0.25})^2 =153.36 \approx 154[/tex]

So the answer for this case would be n=154 rounded up to the nearest integer

Answer:

a. The probability of getting an specific sequence would be

[tex](1/20)*(1/19)*(1/18)*(1/17)*(1/16)[/tex]

b. The probability  of having an specific sequence would be.

[tex]5/20 = 1/4[/tex]

Step-by-step explanation:

a. If you draw 5 marbles without replacement, the probability of getting an specific sequence would be

[tex](1/20)*(1/19)*(1/18)*(1/17)*(1/16)[/tex]

b. If you draw 5 marbles all at once without replacement, the probability  of having an specific sequence would be.

[tex]5/20 = 1/4[/tex]

Step-by-step explanation:

By trigonometric conversion,

Cos -90° = 0

Cos -60° = 0.5

Cos -30° = 0.866

Cos 0° = 1

From the above values, Cos -90° to Cos 0° = 0 to 1

As theta increases from [tex]\frac{-theta}{2}[/tex] to 0, the value of cos theta will increase from 0 to 1 (Option 4)

Step-by-step explanation:

Here given

6x - 2y = 12

2y = 6x - 12

2y = 6(x - 2)

y = 6( x - 2)

2

y = 3(x - 2)

y = 3x - 6

Comparing with y = mx + c

so slope (m) = 3

Hope it will help you :))

Answer:

185

Step-by-step explanation:

sorry. had to do something but im bsck :)

Final answer:

Different materials exhibit varying degrees of thermal expansion when subjected to a temperature change. Polymers such as polyethylene expand the most, followed by soft metals like lead and aluminum, with hard metals like platinum and minerals like quartz showing much less expansion.

Explanation:

When materials undergo a change in temperature, they typically experience a change in size, known as thermal expansion or contraction. This phenomenon happens because the kinetic energy of the particles within the material changes, consequently changing the distances between particles. The amount by which a material expands or contracts is dependent on its coefficient of thermal expansion, which varies widely among different materials. Polymers such as polyethylene show significant thermal expansion, more so than soft metals like lead and aluminum, and much more than hard materials like platinum and quartz. When temperature increases, thermal stress may arise in materials that are constrained and cannot freely expand, leading to deformation or even damage. Platinum, being a metal, would deform more than quartz due to its higher thermal expansion, but less than softer metals and polymers.

To rank the items based on the total change in length along the long axis of beams with a temperature change of 20 degrees, we would expect polyethylene to have the greatest change due to its high coefficient of thermal expansion, followed by soft metals like lead and aluminum. Platinum would have some expansion but considerably less than softer metals and polymers, and quartz would experience the least amount of expansion given its low thermal expansion characteristic.

The ASA and AAS are methods of proving triangle congruence. ASA requires two angles and the included side in one triangle to match the respective parts in the other triangle. AAS requires two angles and a non-included side in one triangle to match the respective parts in the other triangle.

The question refers to two of the many methods to prove that triangles are congruent: Angle-Side-Angle (ASA) and Angle-Angle-Side (AAS). In triangle congruence, congruent means that two triangles have the same size and shape.

For the ASA congruence, two angles and the included side in one triangle must be congruent to the corresponding two angles and the included side in another triangle. For example, if we have two triangles, Triangle ABC and Triangle DEF, if angle A is congruent to angle D, angle B is congruent to angle E, and side AB is congruent to side DE, then the two triangles are congruent by ASA.

For AAS congruence, two angles and a non-included side in one triangle must be congruent to the corresponding two angles and the non-included side in another triangle. For instance, in Triangle ABC and Triangle DEF, if angle A is congruent to angle D, angle B is congruent to angle E, and side BC is congruent to side EF, then the two triangles are congruent by AAS.

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Answer:

400nanometers

Step-by-step explanation:

Based on Margot measurement, the distance for 6wavelengths of visible light is 2400nanometers. To calculate the resulting distance for 1wavelength we have:

6wavelength = 2400nanometers

1wavelength = x

6wavelength × x = 2400nanometers × 1wavelength

x = 2400nanometres/6

x = 400nanometres

Answer:

A point in geometry is a location. It has no size i.e. no width, no length and no depth.

Step-by-step explanation:

If you need more definitions, I suggest you go to mathisfun which is an amazing website! Hope this helped :)

Answer:

(6+2)/(-4+8)= 8/4= 2

y+2=2(x+8)

y+2=2x+16

y=2x+14

Step-by-step explanation:

Given:

Given that the measurements of the triangle.

We need to determine the value of x.

Value of x:

The value of x can be determined using by angle bisector theorem.

The angle bisector theorem states that "if the angle that bisects the triangle will divide the opposite sides into two segments that are proportional to the remaining two sides of the triangle".

Hence, applying the theorem, we have;

[tex]\frac{x}{20-x}=\frac{14}{11}[/tex]

Cross multiplying, we get;

[tex]11x=14(20-x)[/tex]

Simplifying, we get;

[tex]11x=280-14x[/tex]

[tex]25x=280[/tex]

   [tex]x=11.2[/tex]

Thus, the value of x is 11.2

Answer:

For this case we want to determine  if pennies are really fair when flipped, meaning equally likely to land head up or tails, so then the correct system of hypothesis are:

Null hypothesis: [tex]p=0.5[/tex]

Alternative hypothesis: [tex]p \neq 0.5[/tex]

Step-by-step explanation:

Previous concepts

A hypothesis is defined as "a speculation or theory based on insufficient evidence that lends itself to further testing and experimentation. With further testing, a hypothesis can usually be proven true or false".  

The null hypothesis is defined as "a hypothesis that says there is no statistical significance between the two variables in the hypothesis. It is the hypothesis that the researcher is trying to disprove".  

The alternative hypothesis is "just the inverse, or opposite, of the null hypothesis. It is the hypothesis that researcher is trying to prove".  

Solution to the problem

For this case we want to determine  if pennies are really fair when flipped, meaning equally likely to land head up or tails, so then the correct system of hypothesis are:

Null hypothesis: [tex]p=0.5[/tex]

Alternative hypothesis: [tex]p \neq 0.5[/tex]

Final answer:

The appropriate null hypothesis for the experiment is that pennies are fair when flipped, with the alternative hypothesis being that they are not.

Explanation:

The appropriate null hypothesis for this experiment is that the true probability of a penny landing heads up when flipped is 0.5, meaning that pennies are fair when flipped. The alternative hypothesis, denoted as the alternative to the null hypothesis, would be that the true probability of a penny landing heads up when flipped is not 0.5.

To summarize:

Null hypothesis (H0): p = 0.5

Alternative hypothesis (Ha): p ≠ 0.5

Answer:

The answer is 30 sq in i had that question, good luck :)

Answer:

b. There's no statistically significant linear relationship between the number of miles driven and the maintenance cost.

Step-by-step explanation:

The p value that is corresponding in line with the slope of regression line is 0.345, which is quite above the significance level of 0.05. as a result, we failed to discard the null hypothesis that there is no important association or connection between x and y variables.

Going by the above explanation we can then conclude that there's no statistically significant linear relationship between the number of miles driven and the maintenance cost.

Given:

Given that the radius of the circle is 3 units.

The arc length is π.

The central angle is θ.

We need to determine the expression to find the measure of θ in radians.

Expression to find the measure of θ in radians:

The expression can be determined using the formula,

[tex]S=r \theta[/tex]

where S is the arc length, r is the radius and θ is the central angle in radians.

Substituting S = π and r = 3, we get;

[tex]\pi=3 \theta[/tex]

Dividing both sides of the equation by 3, we get;

[tex]\frac{\pi}{3}=\theta[/tex]

Thus, the expression to find the measure of θ in radians is [tex]\theta=\frac{\pi}{3}[/tex]

Answer:

Step-by-step explanation:

Answer:

The P-value for this test is P=0.2415.

Step-by-step explanation:

We have to perform an hypothesis testing on the mean of alla account balances.

The claim is that the mean of all account balances is significantly greater than $1,150.

Then, the null and alternative hypothesis are:

[tex]H_0: \mu=1150\\\\H_a: \mu>1150[/tex]

The sample size is n=20, with a sample mean is 110 and standard deviation is 125.

We can calculate the t-statistic as:

[tex]t=\dfrac{\bar x-\mu}{s/\sqrt{n}}=\dfrac{1170-1150}{125/\sqrt{20}}=\dfrac{20}{27.95}=0.7156[/tex]

The degrees of freedom fot this test are:

[tex]df=n-1=20-1=19[/tex]

For this one-tailed test and 19 degrees of freedom, the P-value is:

[tex]P-value=P(t>0.7156)=0.2415[/tex]

Answer:

Step-by-step explanation:

We would set up the hypothesis test. This is a test of a single population mean since we are dealing with mean

For the null hypothesis,

µ = 6.8 psi

For the alternative hypothesis,

µ ≠ 6.8

This is a 2 tailed test

Since the population standard deviation is given, z score would be determined from the normal distribution table. The formula is

z = (x - µ)/(σ/√n)

Where

x = sample mean

µ = population mean

σ = population standard deviation

n = number of samples

From the information given,

µ = 6.8

x = 6.9

σ = 0.7

n = 140

z = (6.9 - 6.8)/(0.7/√140) = 0.17

Therefore, the value of the test statistic us 0.17

Answer:

100 mL

Step-by-step explanation:

If x is the volume of 35% solution, then:

0.35x + 0.20(50) = 0.30(x + 50)

0.35x + 10 = 0.30x + 15

0.05x = 5

x = 100

You need 100 mL of 35% solution.

The population of deer will double when the growth rate exceeds the mortality rate, and the net effect is a 4% growth rate. It will take approximately 17.3 years for the population to double.

The population of deer will double when their growth rate exceeds the mortality rate and the net effect is a 4% growth rate. We can calculate the time it takes for the population to double using the formula for exponential growth:

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To estimate the product 137 multiplied by 18, we can round the numbers to the nearest ten. 137 is approximately 140, and 18 is approximately 20. The estimated product of 137 x 18 is 2800.

To estimate the product 137 multiplied by 18, we can round the numbers to the nearest ten. 137 is approximately 140, and 18 is approximately 20. Then, we multiply the rounded numbers: 140 x 20 = 2800. Therefore, the estimated product of 137 x 18 is 2800.

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Answer:

a) Entries of A are non negative, that is ai,j ≥ 0 for all 1 ≤ i ≤ n and all 1 ≤ j ≤ n.

c) yes MS is stochastic

Step-by-step explanation:

a) A stochastic matrix is a square matrix whose columns are probability vectors. A probability vector is a numerical vector whose entries are real numbers between 0 and 1 whose sum is 1.

B)

a) Now, suppose Sx=λx for some λ>1. Since the rows of S are nonnegative and sum to 1, each element of vector Sx is a convex combination of the components of x, which can be no greater than maximum of x the largest component of x. On the other hand, at least one element of λx is greater than maximum of x, which proves that λ>1 is impossible and Hence  λ = 1.

b) Then [tex]S^{2}[/tex] =[tex]P^{2}_{ij}[/tex] is also stochastic; it is the two-step transition matrix for the chain {Xn, n = 0,1,…}. To every stochastic matrix S, there corresponds a Markov chain {Xn} for which S is the unit-step transition matrix.

However, not every stochastic matrix is the two-step transition matrix of a Markov chain.

c) Let A and B be two row-stochastic matrices and suppose we know the product of column stochastic matrices is column-stochastic. Observe that,

MS = [tex]((MS)^{T})^{T} = (S^{T}M^{T})^{T}[/tex]

by properties of transpose of a matrix. Let us consider [tex]S^{T} M^{T}[/tex]. It is easy to see that the transpose of a row-stochastic matrix is column-stochastic by definition (and vice versa). Thus, [tex]S^{T}[/tex]and [tex]M^{T}[/tex] are column stochastic and by our assumption, it must then be the case that [tex]S^{T} M^{T}[/tex] is column-stochastic. Since  [tex]S^{T} M^{T}[/tex]  is column-stochastic, then it's transpose [tex](S^{T} M^{T})^{T}[/tex]=MS is row stochastic.

The researchers conducted an experiment to test the effectiveness of a placebo in reducing pain. A statistical test called the paired t-test can be used to analyze the data and determine if the mean BOLD measurements are higher in the first session than in the second. The results of this test will provide evidence to confirm or refute the effectiveness of the placebo.

The researchers conducted an experiment to test the effectiveness of a placebo in reducing pain. They measured the blood oxygen level-dependent (BOLD) signal during two consecutive sessions with electric shocks applied to the volunteers' arms. In the second session, a cream that was actually a placebo was applied to the volunteers. The mean and standard deviation of the differences in BOLD measurements were calculated to determine if there was evidence to confirm that the placebo was effective.

To test if the mean BOLD measurements were higher in the first session than in the second, a statistical test can be used. The paired t-test is suitable for this scenario, as it compares the means of two related samples. The t-test calculates a t-value which can be compared to a critical value to determine if there is evidence of a significant difference. In this case, with a significance level of α = 0.05, if the t-value is greater than the critical value, it would indicate evidence that the mean BOLD measurements are higher in the first session than the second.

If the calculated t-value is greater than the critical value, there is evidence to confirm that the placebo is effective in reducing pain. Conversely, if the calculated t-value is not greater than the critical value, there is not enough evidence to confirm that the placebo is effective. It is important to note that statistical significance does not necessarily imply practical significance, so further investigation may be required to understand the magnitude of the effect.

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Answer:

The steps to finding the upper and lower quartiles are given in the first choice.

1.  Order the data from least to greatest. If you don't do this, the data is random.

2.  Find the median - you will do this so that you can find the midpoint of the data set (half of of the data is smaller and half of the data is larger).

3.  Find the lower quartile - this is the half of the lower half of numbers; think of it as breaking the lower half of the data into 2 sections.  

4.  Find the upper quartile - this is the half of the greater half of numbers; this will break the upper half of the data into 2 sections.  

Answer:

A.

Step-by-step explanation:

Just took the test:)