suppose f(x) is continuous on [2,7] and −4≤f′(x)≤2 for all x in (2,7). use the mean value theorem to estimate f(7)−f(2).

Answer:the probability is 42%

Step-by-step explanation:

k

The volume of the propane tank that has the shape of a cylinder would be =4,710m³

The propane tank has the shape of a cylinder with a given radius and height therefore the formula for the volume of a cylinder should be used to calculate it's volume.

To calculate the volume of a cylinder, the formula that should be used would be = πr²h

Where ;

radius = 10m

height = 15 m

Volume = 3.14 × 10×10× 15

= 4,710m³

Therefore,the volume of the propane tank that has the shape of a cylinder would be = 4710m³.

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The increments of time used to break up the timeline can vary depending on the specific timeline being presented.

The increments of time used to break up the timeline can vary depending on the context and purpose.

However, common time increments include years, months, weeks, or days, which are displayed on the x-axis (horizontal) to divide the timeline into easily understandable segments.

For example, in a historical timeline, the increments might be years, decades, or centuries. In a project timeline, the increments might be weeks or months.

The x-axis (horizontal) is typically where these increments are marked and can help to visualize the timeline more clearly.

Ultimately, the increments chosen should be appropriate for the task at hand and allow for effective planning and tracking of progress.

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To estimate the total volume within 60 cubic feet with a 95% confidence interval using a ratio estimate, one should sample approximately 27 trees.

To determine the required sample size, follow these steps:

1. Identify the desired confidence level (95% in this case).
2. Determine the acceptable margin of error (e.g., 5%).
3. Calculate the population variance (σ²) and mean (µ) from a pilot study or prior data.
4. Use the formula for sample size estimation in ratio estimation: n = (Z² × σ² × (µ/R)²) / E², where n is the sample size, Z is the critical value from the standard normal distribution corresponding to the desired confidence level (1.96 for 95%), σ² is the population variance, µ is the population mean, R is the desired ratio, and E is the acceptable margin of error.

By plugging the given values and solving for n, one can determine the necessary sample size of approximately 27 trees to achieve a 95% confidence interval for the total volume within 60 cubic feet using a ratio estimate.

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The value of g(5) is 20.899 when the function with first derivative is  g′(x)=√(x³ + x), option D is correct.

A differential equation is an equation that involves one or more functions and their derivatives.

To find the value of g(5), we need to integrate the given first derivative g′(x) and then evaluate the function g(x) at x = 5.

Let's find the antiderivative (integral) of g′(x):

∫√(x³ + x) dx

To evaluate this integral, we can use the substitution method.

Let u = x³ + x.

Differentiating both sides with respect to x, we get:

du/dx = 3x² + 1

dx = du / (3x² + 1)

Substituting these values, we have:

g(x) = ∫√u × (du / (3x² + 1))

Now, we can evaluate the integral in terms of u:

g(x) = ∫√u / (3x² + 1) du

To simplify this integral, let's express it in terms of u:

g(x) = ∫√u / (3x² + 1) du

To find g(x), we need to evaluate this integral.

Performing the integral, we have:

[tex]g(x) = (2/9) (3x^2 + 1)^(^3^/^2^) + C[/tex]

Now, we can apply the initial condition g(2) = -7:

[tex]-7 = (2/9) (3(2^2) + 1)^(^3^/^2^) + C[/tex]

[tex]-7 = (2/9)(13)^(^3^/^2^) + C[/tex]

Solving for C:

[tex]C = -7 - (2/9) (13)^(^3^/^2^)[/tex]

Now, we have the expression for g(x):

[tex]g(x) = (2/9)(3x^2 + 1)^(^3^/^2^) - (2/9)(13)^(^3^/^2^) - 7[/tex]

To find g(5), we substitute x = 5 into this expression:

[tex]g(5) = (2/9) (3(5^2) + 1)^(^3^/^2^) - (2/9)(13)^(^3^/^2^) - 7[/tex]

Calculating this expression, we find:

g(5) = 20.899

Hence, the value of g(5) is 20.899.

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Answer:

x≥2

Step-by-step explanation:

x≥2

(a) Given satment "At the 5% significance level, the data provide convincing evidence of a real difference in the proportion who are not affected personally between Americans who make less than $40,000 annually and Americans who make $40,000 annually." is true.

(b) Given statement "We are 95% confident that 16% more to 2% fewer Americans who make less than $40,000 per year are not at all personally affected by the government shutdown compared to those who make $40,000 or more per year." is true.

(c) Given statement "A 90% confidence interval for (pack - P2K) would be wider than the (-0. 16,0. 02) interval." is false. Because a 90% confidence interval would be more precise than a 95% interval.

(d) Given statement "A 95% confidence interval for (P240K - P0K) is (-0. 02, 0. 16)" is true.

(a) At the 5% significance level, the data provide convincing evidence of a real difference in the proportion who are not affected personally between Americans who make less than $40,000 annually and Americans who make $40,000 annually.

The statement is true.

As, The 95% confidence interval for (P<0K - P≥40K) is (-0.16, 0.02).

Since this interval does not contain 0, we can say that at the 5% significance level, the data provide convincing evidence of a real difference in the proportion who are not affected personally between Americans who make less than $40,000 annually and Americans who make $40,000 or more annually.

(b) We are 95% confident that 16% more to 2% fewer Americans who make less than $40,000 per year are not at all personally affected by the government shutdown compared to those who make $40,000 or more per year.

The statement is true.

As, The 95% confidence interval (-0.16, 0.02) indicates that we are 95% confident that 16% more to 2% fewer Americans who make less than $40,000 per year are not at all personally affected by the government shutdown compared to those who make $40,000 or more per year.

(c) A 90% confidence interval for (pack - P2K) would be wider than the (-0. 16,0. 02) interval.

The statement is False.

As a 90% confidence interval would be narrower than the 95% confidence interval.

This is because the 90% confidence interval requires less certainty, thus resulting in a smaller range.

(d) A 95% confidence interval for (P240K - P0K) is (-0. 02, 0. 16)

The statement is true.

As, a 95% confidence interval for (P≥40K - P<0K) would simply reverse the order of subtraction in the original interval, resulting in the interval (-0.02, 0.16).

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The required P-value is 0.0014. The given statement "The P-value calculated for testing H0 : µ ≥ 5.4 versus H1 : µ < 5.4 is a small probability; hence, it is plausible that the mean number of sick days is at least 5.4" is false because a small P-value indicates that the null hypothesis (H0) is less likely to be true.

a. To find the P-value for testing H0: μ ≥ 5.4 versus H1: μ < 5.4, first calculate the test statistic:

Test statistic (z) = (Sample mean - Population mean) / (Standard deviation / √(Sample size))
z = (4.4 - 5.4) / (2.8 / √(80))
z ≈ -3.19

Now, use the z-table or a calculator to find the P-value corresponding to the test statistic:
P-value ≈ 0.0014 (rounded to four decimal places)

b. The statement "The P-value calculated for testing H0 : µ ≥ 5.4 versus H1 : µ < 5.4 is a small probability; hence, it is plausible that the mean number of sick days is at least 5.4" is FALSE.

A small P-value indicates that the null hypothesis (H0) is less likely to be true and we have evidence to support the alternative hypothesis (H1) that the mean number of sick days is less than 5.4.

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The required P-value is 0.0014. The given statement "The P-value calculated for testing H0 : µ ≥ 5.4 versus H1 : µ < 5.4 is a small probability; hence, it is plausible that the mean number of sick days is at least 5.4" is false because a small P-value indicates that the null hypothesis (H0) is less likely to be true.

a. To find the P-value for testing H0: μ ≥ 5.4 versus H1: μ < 5.4, first calculate the test statistic:

Test statistic (z) = (Sample mean - Population mean) / (Standard deviation / √(Sample size))
z = (4.4 - 5.4) / (2.8 / √(80))
z ≈ -3.19

Now, use the z-table or a calculator to find the P-value corresponding to the test statistic:
P-value ≈ 0.0014 (rounded to four decimal places)

b. The statement "The P-value calculated for testing H0 : µ ≥ 5.4 versus H1 : µ < 5.4 is a small probability; hence, it is plausible that the mean number of sick days is at least 5.4" is FALSE.

A small P-value indicates that the null hypothesis (H0) is less likely to be true and we have evidence to support the alternative hypothesis (H1) that the mean number of sick days is less than 5.4.

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Answer:

For Line T:

[tex]m = \frac{5 - 14}{2 - 0} = - \frac{9}{2} [/tex]

Since Lines T and R are perpendicular, the slopes of these two lines are negative reciprocals. So Line R has slope 2/9. We have:

[tex]3 = \frac{2}{9} (4) + b[/tex]

[tex] \frac{27}{9} = \frac{8}{9} + b[/tex]

[tex]b = \frac{19}{9} [/tex]

[tex]y = \frac{2}{9} x + \frac{19}{9} [/tex]

So the equation of Line R is

y = (2/9)x + (19/9)

The volume of the solid obtained by rotating the region bounded by y=0, y=cos(2x), x=π/4, and x=0 about the axis y=-5 is approximately 16.47 cubic units.

To solve this problem, we need to use the method of cylindrical shells. We need to integrate the volume of a cylindrical shell that has height dy, radius r, and thickness dx. The radius r is the distance between the axis of rotation and the curve y=cos(2x).

Since the axis of rotation is y=-5, we need to find the distance between y=-5 and the curve y=cos(2x).

y = cos(2x)

-5 - cos(2x) = r

We need to solve for x in terms of y, so we use the inverse cosine function

2x = arccos(y)

x = 1/2 arccos(y)

Now we can set up the integral for the volume

V = ∫[π/4,0] ∫[-5-cos(2x),-5] 2πr dx dy

V = ∫[π/4,0] ∫[-5-cos(2x),-5] 2π(-5-cos(2x)-(-5)) dx dy

V = ∫[π/4,0] ∫[-5-cos(2x),-5] 2π(5+cos(2x)) dx dy

V = ∫[π/4,0] [2π(5x+xsin(2x)+C)]|-5-cos(2x),-5] dy

V = ∫[π/4,0] 2π(5+5sin(2x)-5cos(2x)-π/2) dy

V = 5π² - 25π/2

v = 16.47 cubic units.

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For each odd natural number n with n >= 3, (1 + 1/2) (1 - 1/3) (1 + 1/4) .... (1 + (-1)^n/n) = 1.

We will use mathematical induction to prove the given statement for all odd natural numbers greater than or equal to 3.

Base case: Let n = 3. Then we have (1 + 1/2)(1 - 1/3) = (3/2) * (2/3) = 1, which satisfies the equation.

Inductive step: Assume the equation holds for some odd natural number k >= 3, i.e., (1 + 1/2) (1 - 1/3) (1 + 1/4) .... (1 + (-1)^k/k) = 1.

We will prove that the equation also holds for k+2.

We can rewrite the product for k+2 as:

(1 + 1/2) (1 - 1/3) (1 + 1/4) .... (1 - 1/(k+1)) (1 + 1/(k+2)) (1 - 1/(k+3))

Using the assumption, we can replace the first k terms with 1.

Thus, we get:

(1) (1 + 1/(k+2)) (1 - 1/(k+3)) = 1 * [(k+4)/(k+2)] * [(k+2)/(k+3)] = (k+4)/(k+3)

Therefore, the equation holds for k+2 as well. By mathematical induction, the statement holds for all odd natural numbers greater than or equal to 3.

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Answer:

the lowest common multiple is 2

We can see that this function is of the same order of magnitude as 1/n. Therefore, we can say that (n-1)/(6n) = Θ(1/n), and 1/n is a good reference function for this function.

To find good reference functions for each of the given functions using the big-Theta notation, we need to find a lower and an upper bound that is both of the same order of magnitude as the function.

i. 3n² + 5n(2n+7)

Expanding the expression inside the parentheses and simplifying, we get:

3n² + 10n² + 35n

= 13n² + 35n

We can see that this function is of the same order of magnitude as n^2. Therefore, we can say that 13n² + 35n = Θ(n²), and n² is a good reference function for this function.

ii. n(n+1)/2

Expanding and simplifying, we get:

n(n+1)/2 = (n² + n)/2

We can see that this function is of the same order of magnitude as n². Therefore, we can say that (n² + n)/2 = Θ(n²), and n² is a good reference function for this function.

iii. 3n + [tex]3n^6[/tex] + 5logn(2n)

We can see that the term [tex]3n^6[/tex] dominates the other terms for large values of n. Therefore, we can say that 3n + [tex]3n^6[/tex] + 5logn(2n) = Θ([tex]n^6[/tex]), and [tex]n^6[/tex] is a good reference function for this function.

iv. n(n-1)/(6n² + log2(n))

For large values of n, the logarithmic term becomes negligible compared to the quadratic term in the denominator. Therefore, we can approximate the function as:

n(n-1)/(6n² + log2(n)) ≈ n(n-1)/(6n²)

= (n-1)/(6n)

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The probability that a salesperson's weekly earnings are between $322 and $621 is approximately 0.6034 or 60.34%.

We can use the standard normal distribution to find the probability that a randomly selected salesperson earns between $322 and $621 in a week.

To do this, we need to first standardize the values using the z-score formula:

z = (x - μ) / σ

where x is the weekly earnings, μ is the mean weekly earnings, and σ is the standard deviation.

For x = $322:

z = (322 - 594) / 100 = -2.72

For x = $621:

z = (621 - 594) / 100 = 0.27

Now, we can find the probability of a z-score being between -2.72 and 0.27 using a standard normal distribution table or a calculator:

P(-2.72 < z < 0.27) = P(z < 0.27) - P(z < -2.72)

= 0.6064 - 0.0030

= 0.6034

Therefore, the probability that a salesperson's weekly earnings are between $322 and $621 is approximately 0.6034 or 60.34%.

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To model this situation, we can use the exponential growth equation:

N(t) = N0 * e^(rt)

where N(t) is the population at time t, N0 is the initial population, e is the base of the natural logarithm (approximately equal to 2.718), r is the growth rate, and t is the time elapsed.

We can use the given information to solve for r:

34,556 = 32,600 * e^(r*1)

e^(r*1) = 34,556 / 32,600

e^(r*1) = 1.0604

r = ln(1.0604)

r ≈ 0.0599

So the function that models the population of bacteria in the petri dish is:

N(t) = 32,600 * e^(0.0599t)

To determine the percent increase of the bacteria each hour, we can use the formula:

percent increase = [(new population - old population) / old population] * 100%

For the first hour, the old population is 32,600 and the new population is 34,556, so:

percent increase = [(34,556 - 32,600) / 32,600] * 100%

percent increase ≈ 5.98%

Therefore, the bacteria population is increasing by approximately 5.98% each hour.

Answer:

3 hours minus 15 minutes = 2 hours 45 minutes (2.75 hours)

(2.75 mph)(2.75 hours) = 7.5625 miles

The y-intercept identified from the graph of the function is (0, 1)

From the question, we have the following parameters that can be used in our computation:

y = 4^x

Next, we graph the function

The graph of the function is added as an attachment

To identify the y-intercept, we look for where x = 0

On the graph, we have

y = 1 when x = 0

Hence, the y-intercept of the graph is (0, 1)

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The consumption function is c = c0 mpc(yd), we have to define the c0 term.

The consumption function c = c0 mpc(yd) represents the relationship between the level of consumption and disposable income (yd), where c0 is the autonomous consumption or the consumption level when disposable income is zero, and mpc is the marginal propensity to consume, which indicates the increase in consumption for every additional unit of disposable income.

Therefore, the c0 term in the consumption function is usually defined as the intercept or the level of consumption that does not depend on changes in disposable income.

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Answer:

5.2

Step-by-step explanation:

2/5 = .4

3/5 = .6

.4(1) + .6(8)

.4 + 4.8 = 5.2

Helping in  the name of Jesus.

To find two numbers that have a sum of 138 and a difference of 54, we can use a system of equations.

Let x be the larger number and y be the smaller number. Then we have:

x + y = 138 (equation 1)

x - y = 54 (equation 2)

We can solve this system of equations by adding equation 1 and equation 2:

2x = 192

Dividing both sides by 2, we get:

x = 96

Substituting x = 96 into equation 1, we get:

96 + y = 138

Subtracting 96 from both sides, we get:

y = 42

Therefore, the two numbers that have a sum of 138 and a difference of 54 are 96 and 42.

The equation of the plane that passes through the point P0(-8, 3, -8) and is perpendicular to the line with parametric equations x = -8 + t, y = 3 + 4t, z = 3t, where -∞ < t < +∞, is given by the equation: 4x + y - z = 35.

To find the equation of the plane, we need to determine a normal vector to the plane. Since the plane is perpendicular to the given line, the direction vector of the line, <4, 1, -1>, will be perpendicular to the plane as well. This direction vector will serve as the normal vector of the plane.

Next, we substitute the coordinates of the point P0(-8, 3, -8) into the equation of the plane, along with the components of the normal vector. This gives us the equation:

4(x - (-8)) + 1(y - 3) - 1(z - (-8)) = 0.

Simplifying, we get:

4x + y - z = 35.

Therefore, the equation of the plane passing through P0(-8, 3, -8) and perpendicular to the given line is 4x + y - z = 35.

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Answer:

(a) The bias of the estimator for σ^2, denoted as MSE(σ^2), is defined as the difference between the expected value of the estimator and the true value of the parameter. In this case, the estimator is (n-1)s^2 / k, where n is the sample size, s^2 is the sample variance, and k is a constant greater than 0.

The expected value of the sample variance s^2 is equal to the true variance σ^2, since s^2 is an unbiased estimator of σ^2. Therefore, the bias of the estimator for σ^2 is given by:

Bias(σ^2) = E[(n-1)s^2 / k] - σ^2

Now substituting the value of s^2, we get:

Bias(σ^2) = E[(n-1)(σ^2) / k] - σ^2

Simplifying further:

Bias(σ^2) = (n-1)σ^2 / k - σ^2

(b) The variance of the estimator for σ^2, denoted as Var(σ^2), is given by the variance of the sample variance s^2, which can be calculated as:

Var(σ^2) = Var[(n-1)s^2 / k]

Since s^2 is an unbiased estimator of σ^2, Var[(n-1)s^2] = 2(n-1)^2σ^4 / (k^2(n-3)), using the known formula for the variance of sample variance.

Therefore, substituting the value of Var[(n-1)s^2] into the equation, we get:

Var(σ^2) = 2(n-1)^2σ^4 / (k^2(n-3))

(c) The mean squared error (MSE) of the estimator for σ^2, denoted as MSE(σ^2), is the sum of the variance and the square of the bias:

MSE(σ^2) = Var(σ^2) + Bias(σ^2)^2

Substituting the values of Var(σ^2) and Bias(σ^2) from parts (a) and (b), respectively, we get:

MSE(σ^2) = 2(n-1)^2σ^4 / (k^2(n-3)) + [(n-1)σ^2 / k - σ^2]^2

(d) To minimize the mean squared error of the estimator, we need to find the value of k that minimizes the MSE(σ^2). This can be done by taking the derivative of the MSE(σ^2) with respect to k, setting it equal to zero, and solving for k. However, since the equation for MSE(σ^2) is quite complex, it may not have a simple closed-form solution for k. In practice, numerical optimization techniques can be used to find the value of k that minimizes the MSE(σ^2) by iterating over a range of possible values for k and calculating the corresponding MSE(σ^2) for each value. The value of k that gives the lowest MSE(σ^2) can then be chosen as the optimal value.

Answer:

a. Discrete

b. Continuous

c. Continuous

d. Discrete

e. Discrete

f. Continuous

g. Discrete

h. Continuous

i. Continuous

j. Discrete

Step-by-step explanation:

a. The number of fence posts in a garden is a discrete data because it is a countable quantity and cannot be measured or subdivided. It can only take on integer values.

b. The length, in meters, of each car in a car park is a continuous data because it can take on any value within a certain range. It can be measured more accurately and can be subdivided into smaller units.

c. The weights of pineapples in a box is continuous data because it can take on any value within a certain range. It can be measured more accurately and can be subdivided into smaller units.

d. The number of pineapples in a box is discrete data because it is a countable quantity and cannot be measured or subdivided. It can only take on integer values.

e. The number of chairs in a classroom is discrete data because it is a countable quantity and cannot be measured or subdivided. It can only take on integer values.

f. The heights of the students in a classroom is continuous data because it can take on any value within a certain range. It can be measured more accurately and can be subdivided into smaller units.

g. The number of mobile phones sold in one day is discrete data because it is a countable quantity and cannot be measured or subdivided. It can only take on integer values.

h. The time it takes to complete a crossword puzzle is continuous data because it can take on any value within a certain range. It can be measured more accurately and can be subdivided into smaller units.

i. The waist sizes of trousers sold in a shop is continuous data because it can take on any value within a certain range. It can be measured more accurately and can be subdivided into smaller units.

j. The number of pairs of trousers sold in a shop is discrete data because it is a countable quantity and cannot be measured or subdivided. It can only take on integer values.

The volume of the described solid is (490/7) π h^3.

The formula for the volume of a right circular cone is:

V = 1/3 πr^2h

In this case, the cone has height 4h and base radius 7r. We need to express the volume in terms of h and r. Since the base radius is 7r, we can write:

r = (1/7) b

where b is the radius of the base of the cone. To find b, we use the fact that the height of the cone is 4h and the base radius is 7r:

h^2 + r^2 = (4h)^2

Substituting r = (1/7) b, we get:

h^2 + (1/49) b^2 = 16h^2

Solving for b, we get:

b^2 = 49(16h^2 - h^2) = 49(15h^2) = 735h^2

Therefore, b = sqrt(735)h, and the volume of the cone is:

V = 1/3 πr^2h = 1/3 π(49/49) b^2 (1/7) 4h = (2/21) π (735h^3)

Simplifying, we get:

V = (490/7) π h^3

Therefore, the volume of the described solid is (490/7) π h^3.

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A graph of the linear equation y = 3x/2 - 5 in slope-intercept form is shown in the image attached below.

In order to to graph the solution to the given linear equation on a coordinate plane, we would use an online graphing calculator to plot the given linear equation and then take note of the point that lie on it;

y = 3x/2 - 5

Next, we would use an online graphing calculator to plot the given linear equation as shown in the graph attached below.

Based on the graph (see attachment), we can logically deduce that a possible solution for the linear equation is the ordered pairs (0, -5) and (3.333, 0), which corresponds to the y-intercept and x-intercept respectively.

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The normalized wave function is obtained by multiplying the original wave function by the normalization constant.

The final expression of normalized wave function is:

Ψ(x,y) = 2/√(ab) [1 - 1/(2nπ)sin(2nπa)][1 - 1/(2mπ)sin(2mπb)] sin(nπxa)sin(mπyb).

We are given a wave function sin(nπxa)sin(mπyb) in two-dimensional Cartesian coordinates, where n and m are integers, and a and b are constants representing the range of x and y respectively.

To normalize the wave function, we need to find the normalization constant C such that the integral of the absolute square of the wave function over the entire range is equal to 1:

1 = ∫∫ |Ψ(x,y)|² dxdy

where Ψ(x,y) = sin(nπxa)sin(mπyb) and the integration is over the range 0≤x≤a and 0≤y≤b.

Using the identity sin²(x) = 1/2(1 - cos(2x)), we can write the absolute square of the wave function as:

Now, we can integrate over x and y using the fact that the cosine function is an odd function, which means that its integral over a symmetric range is zero. Therefore, we have:

Similarly, we can integrate over y and get:

1 = C² 1/2ab [b - 1/(2mπ)sin(2mπb)]

Therefore, we have:

C² = 4/(ab) [1 - 1/(2nπ)sin(2nπa)][1 - 1/(2mπ)sin(2mπb)]

The normalization constant C is positive, so we can take its square root to obtain:

C = 2/√(ab) [1 - 1/(2nπ)sin(2nπa)][1 - 1/(2mπ)sin(2mπb)]

Hence, the normalized wave function is:

Ψ(x,y) = 2/√(ab) [1 - 1/(2nπ)sin(2nπa)][1 - 1/(2mπ)sin(2mπb)] sin(nπxa)sin(mπyb)

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(a) The mean burning rates of the two propellants are not equal. (b) p-value is less than 0.001. (c) β-error is 0.04 or 4%. (d) The 95% confidence interval is: -6.35 ± 2.024 * 3 * sqrt(1/20 + 1/20) = (-10.27, -2.43)

(a) Test statistic is:

t = (x1 - x2) / (s pooled * sqrt(1/n1 + 1/n2))

Standard deviation is:

s = sqrt(((n1-1)*s1^2 + (n2-1)*s2^2) / (n1+n2-2))

So,

t = (18.02 - 24.37) / (3 * sqrt(1/20 + 1/20)) = -3.422

Using a two-tailed test at α = 0.05, and calculated value of t (-3.422) is beyond the critical values of t are ±2.024, we reject the null hypothesis and conclude that the mean burning rates of the two propellants are not equal.

(b) Using a t-table or calculator, the p-value is less than 0.001.

(c) Using a t-table or calculator, the critical values of t for a two-tailed test at α = 0.05 and 38 degrees of freedom are ±2.024. The non-centrality parameter for the test is:

δ = (μ1 - μ2) / (σ pooled * sqrt(1/n1 + 1/n2)) = 2.5 / (3 * sqrt(1/20 + 1/20)) = 1.8257

The power of the test for this non-centrality parameter is 0.96. Therefore, the β-error is 1 - power = 0.04 or 4%.

(d) Confidence interval is given by:

(x1 - x2) ± tα/2,s_p * sqrt(1/n1 + 1/n2)

So,

s_p = sqrt[((20 - 1) * 3^2 + (20 - 1) * 3^2) / (20 + 20 - 2)] = 3

tα/2,s_p = t0.025,38 = 2.024

(x1 - x2) = 18.02 - 24.37 = -6.35

Therefore, the 95% confidence interval is:

-6.35 ± 2.024 * 3 * sqrt(1/20 + 1/20) = (-10.27, -2.43)

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