Answer:
3/8
Explanation:
I just know :) (;
Need help finding how long it will take the object to reach 7 meters.
it should be from -4.9t^2 +29.8t+ 55 but I don't know what to do from there.
Step-by-step explanation:
7 m = - 4.9t^2 + 29.8t + 62 <====solve for 't'
0 = - 4.9t^2 + 29.8t + 56 <===== Use Quadrtatic Formula
with a = - 4.9 b = 29.8 c = 55
to find t = 7.57 seconds
The speeds of vehicles traveling on a highway are normally distributed with an unknown population mean and standard deviation. A random sample of 13 vehicles is taken and results in a sample mean of 55 miles per hour and a sample standard deviation of 7 miles per hour. find the margin of error for a 95% confidence interval estimate for the population mean using the Student's t-distribution
The margin of error is given as 4.22 mph
How to solve for margin of errorMargin of Error = t * (sample standard deviation / √(sample size))
degrees of freedom (df), which is calculated as:
df = n - 1 = 13 - 1 = 12
95% confidence level with 12 degrees of freedom = 2.179.
Margin of Error = t * (s / √n)
Margin of Error = 2.179 * (7 / √13)
Margin of Error ≈ 2.179 * (7 / 3.606)
Margin of Error ≈ 2.179 * 1.939
Margin of Error ≈ 4.22 mph
The margin of error is given as 4.22 mph
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The following letter cards are put in a bag.
REFLEX
A card is picked at random.
A
B
C
D +
E-
0
Which letter on the probability scale shows the probability of:
a) picking a card with an 'E' on it?
b)
picking a card that does not have an 'E' on it?
1
The probability of picking a card with an 'E' is 2/6 and not picking an E is 4/6
The probability of picking a card with an 'E' on it?From the question, we have the following parameters that can be used in our computation:
REFLEX
In the above, we have
Letters = 6
E = 2
So, we have
P(E) = 2/6
This also means that
P(Not E) = 1 - 2/6
P(Not E) = 4/6
Hence, the letters are
Probability scale shows the probability of picking a card with an 'E' on it = E'Probability scale shows the probability of picking a card with not an 'E' on it = Other lettersRead mroe about probability at
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Trevor bought an antique desk. The net value of the desk is equal to the resale value of the desk minus what Trevor paid to buy it. Exponential function f, shown in the table, represents the net value of the antique desk, rounded to the nearest whole dollar, x years after Trevor purchased it.
x 0 1 2 3 4 5
f(x) -37 -26 -13 0 15 32
The exponential function that represents the net value of the antique desk is: f(x) = -37 × [tex]0.7027^{x}[/tex]
Define Exponential function?The exponential function is a mathematical function denoted as "exp(x)" or "[tex]e^x[/tex]", where "e" is Euler's number (a mathematical constant approximately equal to 2.71828) and "x" is the input variable. The exponential function is a special type of mathematical function that grows or decays rapidly as the input value changes.
What is known by the term net value?"Net value" typically refers to the residual value or worth of something after all relevant expenses, debts, or liabilities have been subtracted from its total value or assets.
The table provides values of f(x) for x = 0, 1, 2, 3, 4, and 5. The corresponding values of f(x) are -37, -26, -13, 0, 15, and 32, respectively.
Using the given data, we can create the following exponential function in the form f(x) = a × [tex]b^{x}[/tex], where a and b are constants to be determined:
f(0) = a ×[tex]b^{0}[/tex] = -37
f(1) = a × b¹= -26
f(2) = a × b² = -13
f(3) = a × b³ = 0
f(4) = a × b⁴ = 15
f(5) = a × b⁵ = 32
To find the values of a and b, we can use a system of equations. We can divide the equations f(1) = a × b¹ = -26 by f(0) = a ×b⁰ = -37 to eliminate a:
(-26) / (-37) = b¹ / b⁰
0.7027 ≈ b
Substituting the value of b back into any of the equations, we can solve for a. Using f(0) = a ×b⁰ = -37:
-37 = a × 1
a = -37
So, the exponential function that represents the net value of the antique desk is:
f(x) = -37 × [tex]0.7027^{x}[/tex]
The values are rounded to the nearest whole dollar.
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Answer:
During the first three years Trevor owned the desk, the resale value was less than the cost. Then it exceeded the cost after year 3.
Step-by-step explanation:
See attachment
(x+5)/(x+8)=1+(6/(x+1))
Answer:
(x+10)/(x+8).
Step-by-step explanation:
(x+5)/(x+8) = (x+5)/(x+8) + (x+5)/(x+1)
= (x+5) + (x+5)/(x+1)
= (x+10)
Question 5 of 25
What are the domain and range of y= sin x? Select one choice for domain
and one for range.
A. Domain:
/+nr
B. Range: All real numbers
C. Domain: All real numbers
D. Range: -1≤1
The domain and range of this sine function y = sinx include the following:
C. Domain: All real numbers
D. Range: -1 ≤ y ≤ 1
What is a range?In Mathematics and Geometry, a range can be defined as the set of all real numbers that connects with the elements of a domain.
Furthermore, the horizontal extent of any graph of a function represents all domain values and they are always read and written from smaller to larger numerical values, and from the left-hand side of the graph to the right-hand side.
By critically observing the graph shown in the image attached above, we can reasonably and logically deduce the following domain and range:
Domain = {-∞, ∞}, x|x ∈ R, or all real numbers.
Range = {-1, 1}, y ≥ or -1 ≤ y ≤ 1.
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The doubling time of a bank account balance is 10 years. By what factor does the balance grow in 30 years?
The doubling time of a bank account balance is the amount of time it takes for the balance to double. In this case, the doubling time is 10 years, which means that the balance will double every 10 years.
Let's say the initial balance in the bank account is B. After 10 years, the balance will have doubled to 2B. After another 10 years (i.e., 20 years from the initial balance), the balance will have doubled again to 4B. Finally, after another 10 years (i.e., 30 years from the initial balance), the balance will have doubled one more time to 8B.
Therefore, after 30 years, the balance in the bank account will have grown by a factor of 8B/B, which simplifies to just 8. This means that the balance in the bank account will be 8 times the initial balance after 30 years.
To summarize, the balance in the bank account will double every 10 years due to the given doubling time. After 30 years, it will have doubled three times, resulting in a growth factor of 2 x 2 x 2 = 8, which means the balance will be 8 times the initial balance.
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PLS HELP!!
hassan is finding the quotient of (2+3i) and (-4-i)
Evaluate the function for f(2)
a. f(x) = 8x + 7
Answer:
23
Step-by-step explanation:
replace x with 2 8×2+7=23
Answer:23
Step-by-step explanation: its actually really simple, all you have to do is replace x for 2, giving you the equation: f(2) = 8x2 + 7 then all you have to do is solve, 8x2 is 16 and 16+7 is 23, and thats how you get the answer.
Find the surface area of
a right cylinder with a
radius of 2.5 feet and a
height of 7.5 feet.
Round your answer to
the nearest hundredth.
The surface area is about
feet.
長
square
The surface area is about 157.08 square feet. use formula for the surface area of a right cylinder to get answer .
what is surface area ?
Surface area is the measure of the total area that the surface of a three-dimensional object occupies. In other words, it is the sum of the areas of all the faces or surfaces of the object. Surface area is usually measured in square units
In the given question,
The formula for the surface area of a right cylinder is:
S = 2πr² + 2πrh
where r is the radius of the cylinder, h is its height, and π is a mathematical constant approximately equal to 3.14159.
Substituting the given values, we get:
S = 2π(2.5)² + 2π(2.5)(7.5)
S ≈ 2π(6.25) + 2π(18.75)
S ≈ 39.27 + 117.81
S ≈ 157.08
Rounding this to the nearest hundredth, we get:
The surface area is about 157.08 square feet.
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express 2x^2-10x+8 in the form of a(x+b)^2+c where abc are constants and use your answer to state the minimum value of y=2x^2-10x+8
For the given quadratic equation, the value of constant abc is 45/8.
We need to rewrite the given quadratic equation in the form of a(x+b)²+c, where a, b, and c are constants, and then find the product abc. To do this, we'll complete the square.
Given quadratic equation: 2x² -10x+8
Follow these steps to determine the product:
1: Divide the entire equation by the leading coefficient 2:
x² -5x+4
2: Add and subtract the square of half the linear coefficient inside the parentheses. Half of 5 is 5/2, and (5/2)² is 25/4:
x² - 5x + 25/4 - 25/4 + 4
3: Combine the terms and rewrite the equation in the form a(x+b)²+c:
(1)(x - 5/2)² - 9/4
4: Now, we can see that a = 1, b = -5/2, and c = -9/4. So the product abc is:
abc = (1)(-5/2)(-9/4) = (45/8)
Therefore, the value of abc is 45/8.
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find the range of h(x)=-4x^2-6x-4
The range of h(x)=-4x^2-6x-4 is (∞, -13).
How to find the range of range of h(x)=-4x^2-6x-4Using the vertex notion, find the range of the function h(x)=-4x2-6x-4.
The function's vertex is at x = -b/2a,
where a and b are the coefficients of x2 and x, respectively.
Because a = -4 and b = -6 in this situation, the vertex is at x = -(-6)/(2*(-4)) = 3/4.
To find the vertex's y-coordinate, enter x = 3/4 into the function:
h(3/4) = -4(3/4)^2 - 6(3/4) - 4 = -13
As a result, the function's vertex is at (3/4, -13).
Hence, the function's range is (∞, -13).
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with 3 to 4 paragraphs on your thoughts on the income gap between the richest and poorest in the United States. Make sure your content is factual and address the possible causes and what we might do as a nation to correct it in some way. At least 2 sources - APA format.
Find the exact values of x and y.
The exact values of x and y in the triangles are calculated and listed below
Finding the exact values of x and yFigure 7
Here, we have
y = √(6² + 1²) --- pythagorean theorem
This gives
y = √37
And, we have
x = √(10² - 6²) --- pythagorean theorem
x = 8
Figure 8
Here, we have
x = 1/2 * 10 --- midsegment of equilateral triangle
This gives
x = 5
And, we have
y = √(10² - 5²) --- pythagorean theorem
y = 5√5
Figure 10
Here, we have
2x = √(6² + 8²) --- pythagorean theorem
2x = 10
x = 5
So, we have
x = y = 5
Figure 11
Here, we have
y = 5
And we have
x = √(13² - 5²) --- pythagorean theorem
x = 12
Figure 13
By similar triangles, we have
x/5 = (x + y)/10
This gives
x = y
So, we have
x = y = 3
Figure 14
By similar triangles, we have
x = 6/3 * 4
x = 8
And then, we have
y = √(6² + 8²) --- pythagorean theorem
y = 10
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Identify the horizontal shift (h) and the vertical shift (k). Then find the amplitude (|a|), if applicable, the frequency (b), and the period (P). y=tan x, y=cot x
Answer:
For y = tan(x), there is no horizontal or vertical shift (h = 0, k = 0). The amplitude is not applicable in this case. The frequency is b = 1 and the period is P = π.
For y = cot(x), there is no horizontal or vertical shift (h = 0, k = 0). The amplitude is not applicable in this case. The frequency is b = 1 and the period is P = π.
I need help completing the table and finding the velocity
We can conjecture that the value of the instantaneous velocity at t=3 is 81.6.
What is the average velocity over an interval?To find the average velocity over an interval, we use the formula:
average velocity = (change in distance)/(change in time)
Using the position function s(t) = -16t^2 + 100t, we can find the change in distance over an interval [a, b] by subtracting the value of s(a) from the value of s(b):
change in distance = s(b) - s(a)
change in distance = [-16(b^2) + 100b] - [-16(a^2) + 100a]
change in distance= -16(b^2 - a^2) + 100(b - a)
Similarly, we can find the change in time over the same interval by subtracting a from b:
change in time = b - a
Using these formulas, we can complete the table as follows:
Time Interval | Average Velocity
[2,3] | 84
[2.9,3] | 82
[2.99,3] | 81.6
[2.999, 3] | 81.6
[2.9999,3] | 81.6
Based on these results, we can make a conjecture about the value of the instantaneous velocity at t = 3.
From the table, the average velocity over smaller and smaller intervals around t=3 is approaching a value of 81.6.
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Claire works at the Sweet Shop, where candy is bagged and sold by its weight. Claire's last 4 sales of gourmet gummy worms are shown in the table.
- The cost of the gummy worms is proportional to the amount, in pounds, of gummy -worms purchased.
- This situation can be represented by an equation in the form y = kx, where k is the constant of proportionality.
What is the constant of proportionality?
A. $8.30
B. $8.40
C. $14.70
D. $4.73
Answer:
B
Step-by-step explanation:
If you take any set of the values and divide the cost (y) by the gummy worms (x) you get 8.4
The point (8, −15) was reflected over an axis to (−8, −15). Which axis was it reflected over? Explain.
Answer: it is reflected by y-axis
Step-by-step explanation: as we know when point (x,y) reflected by y axis the value of y remains the same and the sign of x will be changed since the image is rotated horizontaly
Answer:
y-axis
Step-by-step explanation:
When a point is reflected over the y-axis, the x-coordinate of the point becomes the additive inverse of the original number.
Here, (8, -15) became (-8, -15). The only change in value of the coordinates is the value of the x-coordinate, 8, which became its additive inverse, -8.
Answer: y-axis
Answer: it is reflected by y-axis
Step-by-step explanation: as we know when point (x,y) reflected by y axis the value of y remains the same and the sign of x will be changed since the image is rotated horizontaly
Answer:
y-axis
Step-by-step explanation:
When a point is reflected over the y-axis, the x-coordinate of the point becomes the additive inverse of the original number.
Here, (8, -15) became (-8, -15). The only change in value of the coordinates is the value of the x-coordinate, 8, which became its additive inverse, -8.
Answer: y-axis
The Battery Park Stable feeds and houses horses used to pull tourist-filled carriages through the streets of Charleston’s historic waterfront area. The stable owner, an ex-racehorse trainer, recognizes the need to set a nutritional diet for the horses in his care. At the same time, he would like to keep the overall daily cost of feed to a minimum. The feed mixes available for the horses’ diet are an oat product, a highly enriched grain, and a mineral product. Each of these mixes contains a certain amount of five ingredients (labeled as A, B, C, D, and E) needed daily to keep the average horse healthy. The table below shows these minimum requirements, units of each ingredient per pound of feed mix, and costs for the three mixes. In addition, the stable owner is aware that an overfed horse is a sluggish worker. Consequently, he determines that 6 pounds of feed per day are the most that any horse needs to function properly.
a) (4 pts) Is this a maximization or a minimization problem? What is the objective?
b) (8 pts) Formulate this problem mathematically. Use X1, X2, and X3 to represent the amount of
oat product, enriched grain, and mineral product, respectively. Write down or type the objective
function and all constraints clearly. (Don’t forget the nonnegativity constraints when applicable.)
c) (8 pts) Set up this problem in Excel and use Solver to find the optimal daily mix of the three
feeds, i.e., the optimal value for X1, X2, and X3.
Answer:
Step-by-step explanation:
a) This is a minimization problem. The objective is to minimize the daily cost of feed for the horses while meeting their minimum nutritional requirements.
b) Let X1, X2, and X3 represent the number of pounds of oat product, enriched grain, and mineral product, respectively, that the stable owner should feed to the horses daily.
The objective function is:
Minimize 0.8X1 + 0.9X2 + 1.1X3
The constraints are:
Ingredient A: 0.15X1 + 0.20X2 + 0.25X3 >= 2.5
Ingredient B: 0.10X1 + 0.15X2 + 0.05X3 >= 2.0
Ingredient C: 0.05X1 + 0.05X2 + 0.10X3 >= 1.0
Ingredient D: 0.02X1 + 0.04X2 + 0.03X3 >= 0.3
Ingredient E: 0.08X1 + 0.07X2 + 0.06X3 >= 1.4
Non-negativity: X1 >= 0, X2 >= 0, X3 >= 0
c) To set up this problem in Excel, we can create a spreadsheet with the following columns: "Feed Mix," "Ingredient A," "Ingredient B," "Ingredient C," "Ingredient D," "Ingredient E," "Cost per Pound," and "Amount to Feed."
We can then enter the data from the table provided in the problem, and add formulas to calculate the total amount of each ingredient in each feed mix and the total cost of each feed mix based on the amount fed.
Next, we can use Solver to find the optimal mix of feed for the horses. We will set the objective to minimize the total cost of feed, subject to the constraints listed above. Solver should be able to find the optimal values of X1, X2, and X3 that meet the nutritional requirements and minimize the cost of feed.
tion K Some states now allow online gambling. As a marketing manager for a casino, you need to determine the percentage of adults in those states who gamble online. How many adults must you survey in order to be 99% confident that your estimate is in error by no more than three percentage points? Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of adults who gamble online. n= (Round up to the nearest integer.)
a) n = 4148
b) n = 2449
How to solveThe sample size for proportion:
Given that,
E = 2% = 0.02
c = 99% = 0.99
Using the z table,
= 2.576 for 99% confidene level.
Using the z-table, search for 0.9950 probability and see where is 0.9950 cumulative probability nearly and then see the corresponding z value.
Step 2/2
a)
Here p is unknown.
In this case, take p = 0.5
n = 4147.36
= 4148
b Here, p = 18% = 0.18
Now,
n = 2448.601344
= 2449
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Suppose that, for a certain exam, a teacher grades on a curve.
It is known that the mean is 60 and the standard deviation is 5. There are 35 students in the class. (Round your answers to the nearest whole number.)
(a) How many students should receive a C?
student(s)
(b) How many students should receive an A?
student(s
2 students to get a grade C and 0 students to get a grade A.
What is the mean?In mathematics , in addition to the mode and median, the mean is one of the measures of central tendency. the mean is the average of the values in the given set. It indicates that values in a particular data set are distributed equally.The total values provided in a datasheet must be added, and the sum must be divided by the total number of values in order to determine the mean.
What is the z-score?The relation between a value and a set of values of mean is described by the statistical measurement is known as the Z-score. Standard deviations from the mean are used to measure Z-score. A Z-score of zero means the data point of score is the same as the mean score.
We require the distribution of scores in order to estimate the number of students who should earn a given grade. We may determine the z-score for each grade using the mean and standard deviation, presuming that the scores have a normal distribution.
(a) We must locate the z-score equivalent to a C grade in order to establish the number of pupils who should receive a C. Assuming that a C equals a score between 70 and 79, the following formula can be used to determine the z-scores for these values:
(70 - 60) / 5 = 2 is the z-score for 70.
79's z-score is (79 - 60) / 5 = 3.8
We can calculate the percentage of the distribution that falls between these two z-scores using a z-table or a calculator:
P(2 ≤ z ≤ 3.8)
This implies that roughly 4.55% of the students to get a C grade. We can multiply this percentage by the total number of students Than we get
0.0455 x 35 ≈ 2
therefore,approximately 2 students to get a grade C.
b) the z-score to calculate the number of pupils who should receive an grade A. Considering that a grade A of 90 or above 90,Now we can calculate the z-score for 90
than we get .
the z-score for 90 = (90 - 60) / 5 = 6 .
We calculate the percentage of the distribution that lies to the right of this z-score using a z-table or a calculator:
P(z ≥ 6) ≈ 0
therefore,0 students to get a grade A.
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What is the volume of the rectangular prism?
A rectangular prism where the area of the base is 12 square centimeters and the height is 7 centimeters.
84 cm3
84 cm2
19 cm3
19 cm2
84cm³
V= 12 x 7 = 84
volume is always cubed btw
Proration means what your paying monthly
What is proration?
It's when you only pay for part of something you used.
Like if you only use half of a month of a service, you only pay for half of the monthly cost.y cost.
When is proration used?
When you sign up for a service that you don't use for a full month.
When you change your service in the middle of a billing cycle.
Why is proration used?
To make sure people only pay for what they use.
To be fair and not overcharge people for services they didn't fully use.
chatgpt
Which measure do you think is more typical of the data?
The measure that is more typical of the data is the Median.
When to use median ?In comparison to the mean, utilizing the median is oftentimes a more suitable option when analyzing data sets with significant outliers or extreme values.
As these likely cause an aberrant affect on the mean, it can provide an unreliable measure of central tendency; without being subject to anomalies, the median serves as a more reliable gauge of the typical salary. Here, the Median proves significantly less than the Mean, reaffirming its superiority in cases involving considerable disparities.
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you pick a card at random; 456. What is P (greater than 4 or less than 5) write your answer as a percentage
The probability that a card greater than 4 or less than 5 is 1 or 100%
What is probability?A probability is a number that reflects the chance or likelihood that a particular event will occur. Probabilities can be expressed as proportions that range from 0 to 1, and they can also be expressed as percentages ranging from 0% to 100%.
The probability of picking a card greater than 4 i.e 5 or 6 = 2/3
The probability of picking a card less than 5 i.e
4 = 1/3
Therefore the probability of picking of a card greater than 4 or less than 5 = 2/3 + 1/3 = 3/3
= 1
the total probably is given by 1.
therefore in percentage , it will be 1/1 × 100 = 100%
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HELPPP PLSSSSSSSSSS
Decide the type or transformation and state the rule
The transformation rule used for the diagram is: Shift by 3 units upwards and a shift by 5 units to the left.
What is the transformation rule that was used?
There are different methods of transformation such as:
Reflection
Dilation
Rotation
Translation
Now, from the given graph, we see that both objects remain the same size and the object on the right was first if all shifted by 3 units upwards.
Now, the transformed image in the left is the exact copy and not a mirrored copy and so there was not reflection but only another translation which was by 5 units to the left
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Determine the volume.
6 units
10 units
8 units
5
Answer:
Step-by-step explanation:
11.7
2 2/7 - 1
Must give complete and correct explanation
Answer:
1 2/7
Step-by-step explanation:
State that 1 = 7/7
2 2/7 - 7/7
Convert 2 2/7 into improper fraction
= 16/7
=16/7 - 7/7
16 - 7 = 9
= 9/7
Simplify back to mixed fraction
= 1 2/7
ASAPP RIGHT TOO PLS Rajindri, a physician assistant who works in an emergency room, earns $163 for every two hours that she works.
Which equation represents the relationship between d, the number of dollars Rajindri earns, and t, the amount of time Rajindri works, in hours?
A. d= 163 + t
B. d= 163/2 × t/2
C. d = 163t
D. d = 81.50t
Answer:
C
Step-by-step explanation:
The correct equation that represents the relationship between d (the number of dollars Rajindri earns) and t (the amount of time Rajindri works in hours) is: C
An engineer designed a valve that will regulate water pressure on an automobile engine. The engineer designed the valve such that it would produce a mean pressure of 4.4 pounds/square inch. It is believed that the valve performs above the specifications. The valve was tested on 110 engines and the mean pressure was 4.6 pounds/square inch. Assume the standard deviation is known to be 0.8. A level of significance of 0.01 will be used. Determine the decision rule. Enter the decision rule.
The decision rule is Reject the null hypothesis if the calculated z-value is greater than 2.33.
To determine the decision rule, we need to perform a hypothesis test to see if the sample mean of 4.6 pounds/square inch is significantly different from the population mean of 4.4 pounds/square inch.
Null hypothesis: The population mean pressure is equal to 4.4 pounds/square inch.
Alternative hypothesis: The population mean pressure is greater than 4.4 pounds/square inch.
We will use a one-tailed z-test with a level of significance of 0.01. Since the standard deviation is known, we can use the z-test formula:
z = (x - μ) / (σ / √n)
where x is the sample mean, μ is the population mean, σ is the population standard deviation, and n is the sample size.
Plugging in the values, we get:
z = (4.6 - 4.4) / (0.8 / √110) = 2.75
The critical value for a one-tailed test with a level of significance of 0.01 is 2.33 (obtained from a standard normal distribution table). Since our calculated z-value of 2.75 is greater than the critical value of 2.33, we reject the null hypothesis.
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