I need help on this problem pleaseeeeeeeeeee
why is your answer to part (a) approximately correct even though the population distribution of diameters is clearly not normal? would the same approach be equally valid for a sample of size 2 rather than 25? why or why not?
In part (a), we used the Central Limit Theorem (CLT) to approximate the sampling distribution of the sample mean. The CLT states that, under certain conditions, the sampling distribution of the sample mean will be approximately normal, regardless of the population distribution.
The conditions for the CLT are:
The sample is randomly drawn from the population.
The sample size is large (usually, n >= 30 is considered large enough).
The samples are independent.
In this case, we assume that the sample was randomly drawn from the population of diameters, and the sample size of 25 is large enough to satisfy the second condition. The samples are assumed to be independent, as we are sampling without replacement from a large population.
Therefore, we can apply the CLT and use the normal distribution to approximate the sampling distribution of the sample mean.
For a sample of size 2, the sample mean will still have a sampling distribution, but the CLT may not be applicable. If the population distribution is highly skewed or has heavy tails, a sample size of 2 may not be sufficient to smooth out the sampling distribution, and it may not be normal.
In this case, a normal approximation may not be appropriate, and other methods, such as bootstrapping or permutation tests, may be more appropriate for inference.
In summary, the normal approximation based on the CLT is valid for large sample sizes, regardless of the population distribution. For small sample sizes, other methods may be more appropriate, and the normal approximation may not be valid if the population distribution is highly skewed or has heavy tails.
Question: The basal diameter of a sea anemone is an indicator of its age. The density curve shown here represents the distribution of diameters in a certain large population of anemones; the population mean diameter is 4.2cm, and the standard deviation is 1.4cm.
Let Y dash represent the mean diameter of 25 anemones randomly chosen from the population.
(a) Find the approximate value of Pr{4 ≤ Ydash ≤ 5}.
(b) Why is your answer to part (a) approximately correct even though the population distribution of diameters is clearly not normal? Would the same approach be equally valid for a sample of size 2 rather than 25?Why or why not?
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asuming 14 people, 5 men and 9 women, how many ways can they sit in a circle such that every man is diametricaly opposite a woman
There are 7920 ways to seat 14 people in a circle such that every man is diametrically opposite a woman.
In this problem, we want to find the number of ways to seat 14 people in a circle such that every man is diametrically opposite a woman.
Since every man must be diametrically opposite a woman, we can pair each man with one woman. There are 5 men and 9 women, so there are 5 pairs. We need to find the number of ways to seat these 5 pairs of people in a circle.
To do this, we can first seat one pair in any position. Then, we can seat the second pair anywhere but opposite the first pair. This gives us 11 positions for the second pair. Continuing in this way, we see that there are 11 * 6 * 5 * 4 * 3 = 7920 ways to seat the 5 pairs of people in a circle.
So, there are 7920 ways to seat 14 people in a circle such that every man is diametrically opposite a woman.
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Assuming 14 people, 5 men and 9 women, how many ways can they sit in a circle such that every man is diametrically opposite a woman?
YOUR MISSION: Create and solve a linear equation based on a real-world problem on any media of your choice (e.g. poster board, computer, etc). Make sure you only have 1 variable (let's say X), but this variable can be used multiple times throughout the equation. For example, 2(X + 1) = 3X + 5-1X
Note: A constant is a number that is standing all by itself as its own term. For example, in 2X+1=5, the constants are 1 and 5. A coefficient is the number attached to the left of the variable, also known as in front of the variable. For example, in 2X +1 =5, the coefficient is 2.
The graph shows f(x)and its transformation g(x). Enter the equation for g(x) in the box. g(x) =
The function g(x) can be written as -
g(x) = f(x - 1)
What is graph translation?Graph translation is a process of moving the graph over the dimensional plane either vertically, horizontally or both.
A translation can take place either horizontally or vertically as -
Vertical translation → Upward (y + k) & Downward (y - k).Horizontal translation → Upward (x + k) & Downward (x - k).Given are the graphs of exponential functions f(x) and g(x).
We can write the exponential function g(x) as -
g(x) = f(x - 1)
Therefore, the exponential function g(x) can be written as -
g(x) = f(x - 1).
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doughnuts are sold in bags and cartons
a bag holds 4 doughnuts and a carton holds 10 doughnuts
Answer:
Step-by-step explanation:
14 doughnuts in total
what are the lengths or each side?
Answer:
5
Step-by-step explanation:
The rule of the sides of a triangle is that the sum of the lengths of any two sides of a triangle is always greater than the length of the third side. This rule is also known as the triangle inequality theorem.
Quadrilateral QRST is shown. Lynn draws quadrilateral WXYZ, which is similar to quadrilateral QRST, with WX = 5 inches.
What is the measure of angle Y?
Since angle S is 65°, angle Y will also be 65°
What are similar shape ?Similar shapes are shapes that have the same shape, but their sizes may vary. All equilateral triangles, squares of any side lengths are examples of similar objects. In other words, if two triangles are similar, then their corresponding angles are congruent and corresponding sides are in equal proportion.
Since quadrilateral QRST is similar to quadrilateral WXYZ, then angle Q = angle W , angle R = angle X and angle S = angle Y and angle T = angle Z.
Since angle S is 65° from the diagram shown, angle will be measured as 65°.
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Which graphs represent functions?
Graph A
Graph B
Graph C
Answer:
Graphs B and D
I can't see all the options since the image is cropped but it does look like the first option
Step-by-step explanation:
A function, y = f(x0 can have one and only one value for a specific value of x
Graphically we can determine whether a graph represents a function or not by drawing a vertical line through a value of x and finding out if it intersects the graph at more than one point
Graph A: Not a function
If we draw a vertical line at say x = 0, it intersects the graph at two points y = 2 and y = -2. Therefore it is not a function
We need to see only one violation of this rule to conclude it is not a function
Graph B: Function
This is a function. There are 5 points plotted for 5 values of x (x = -5, -4, -1, 1 and 2) and at none of these values of x does a vertical line cross two points
Graph C Not a function
At x = 1, the vertical line will cross at 2 points (1, 5) and (1, -3). Essentially there are 2 y values, 5 and -3 for a single x value of 1
So not a function
Graph D Function
At no value of x does a vertical line pass through more than one point. Hence it is a function
A composite figure is shown.
A five-sided figure with two parallel bases. The top one is 5 centimeters. The vertical height between these bases is 2.7 centimeters. That vertical height intersects the bottom base, leaving 3 centimeters between it and the vertex to the left. The side on the right is the longest at 6.8 centimeters. There is a horizontal line connecting the vertex of the bottom base to the 6.8-centimeter side and that line is 3.4 centimeters.
Which of the following represents the total area of the figure?
24.52cm
31.49cm
42.07cm
49.04cm
Answer:
Therefore, the correct answer is (a) 24.52 cm^2.
Step-by-step explanation:
To find the area of the figure, we need to find the area of the two triangles and the trapezoid and add them together.
The top triangle has a base of 5 cm and a height of 2.7 cm, so its area can be found by multiplying the base by the height and dividing by 2: (5 * 2.7) / 2 = 13.5 cm^2.
The bottom triangle has a base of 3 cm and a height of 2.7 cm, so its area can be found by multiplying the base by the height and dividing by 2: (3 * 2.7) / 2 = 4.05 cm^2.
The trapezoid has a base of 5 cm, a top length of 6.8 cm, and a height of 3.4 cm, so its area can be found using the formula for the area of a trapezoid: ((5 + 6.8) / 2) * 3.4 = 20.06 cm^2.
The total area of the figure is the sum of the areas of the three shapes: 13.5 + 4.05 + 20.06 = 37.61 cm^2.
Therefore, the correct answer is (a) 24.52 cm^2.
solve the systems of equations using elimination
2x-7y=-13
8x-7y=11
Answer:
( [tex]-\frac{1}{3}[/tex] , [tex]-\frac{41}{21}[/tex] )
Step-by-step explanation:
a two-tailed test is a hypothesis test in which the rejection region is . a. only in the upper tail of the sampling distribution b. in both tails of the sampling distribution c. in one tail of the sampling distribution d. only in the lower tail of the sampling distribution
A two-tailed test is a hypothesis test in which the rejection region is option (B) in both tails of the sampling distribution
The hypothesis test is defined as the statistic approach checking the results of a research study support a particular theory when we apply that result to population
A two-tailed test is a hypothesis test that defined in which the critical area of the distribution is two sided, so the sample will be greater than or less than a certain range of values
Therefore, the rejection region of a two-tailed test is a hypothesis test is in both tails of the sampling distribution.
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which value could be the length of the side of the triangle the triangle is not drawn to scale 5 and 12 and x
The third side is between 7 and 17 inches long.
What is the theorem of triangle inequality?This theorem states that for any triangle, the sum of the lengths of the first two sides will always be greater than the length of the third side.
A triangle's two sides have lengths of 5 and 12 inches.
According to the triangle Inequality (theorem), any triangle's two sides must add up to more than its third side.
The length of the third side will be,
5 + 12 = 17 inches
It is to be noted that the difference between the two sides cannot be less on the third side.
The third side must be greater than,
12 – 5 = 7 inches.
As a result, the third side's length ranges from 7 to 17 inches.
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y at least inequality symbol 2/3x + 2 y<-1/3x+1
After solving the given inequality question, we will get x < -9.
What is an inequality symbol?A mathematical sign for comparing two values or expressions is an inequality symbol. Inequality symbols include: (less than), > (greater than), (less than or equal to), and (greater than or equal to). Inequalities can be used to represent connections between two or more variables, for as 5 10 indicating that 5 is less than 10. Inequalities can also be used to define mathematical equations or to describe connections between variables. The equation x + 2 7 can, for example, be used to represent the relationship between x and 7, or to communicate that the value of x must be less than 5 for the equation to be true.
In the given question,
2/3x + 2y < -1/3x + 1
⇒ 2/3x + 2y - (-1/3x + 1) < 0
⇒ 5/3x + 3 < 0
⇒ 5/3x < -3
⇒ x < -9
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Find the area under the standard normal distribution curve between =z−1.97 and =z1.21. Use The Standard Normal Distribution Table and enter the answer to 4 decimal places.
Can any one help with me please
Answer:
85
Step-by-step explanation:
The vertical line that y is on adds up to 180 so if we take 180 - the number we already know (95) we get 85
which of the following shows 87 and 1/2% as a fraction? 7/8, 5/8, -8/75, none of these
Answer:
Step-by-step explanation:
87.5% = 87.5/100 = 875/1000= 7/8
a heavy rope, 30 ft long, weighs 0.7 lb/ft and hangs over the edge of a building 80 ft high. (a) how much work w is done in pulling the rope to the top of the building?
A heavy rope, 30 ft long, weighs 0.7 lb/ft and hangs over the edge of a building 80 ft high, the work done in pulling the rope to the top of the building is 1785 ft-lb.
To calculate the work done in pulling the rope to the top of the building, we need to use the formula:
W = F x d
where W is the work done, F is the force applied, and d is the distance over which the force is applied.
In this problem, we can calculate the force required to pull the rope as the product of its weight per unit length (0.7 lb/ft) and the length of the rope (30 ft). Thus, the force required is:
F = 0.7 lb/ft x 30 ft = 21 lb
To calculate the distance over which the force is applied, we need to calculate the total length of the rope that needs to be lifted. This can be found using the Pythagorean theorem, as follows:
l = √(30^2 + 80^2) = 85 ft
So the distance over which the force is applied is 85 ft.
Now we can substitute the values for F and d into the formula for work to get:
W = F x d = 21 lb x 85 ft = 1785 ft-lb
This calculation shows how the formula for work can be used to calculate the energy required to lift an object against gravity over a given distance.
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Graph the inequality below on the number line. a<3
The number line for a < 3 is as shown in the figure below and we use an open circle on 3 and all the numbers to the left of 3 in the number line will be the values of a.
What is a number line?
A number line is a representation of a graduated straight line that is used to represent real numbers visually. It is assumed that every point on a number line corresponds to a real number and that every real number corresponds to a point. The endpoints of this line go on forever.
We can see the values that inequality represents by placing them on a number line. On a number line, inequalities are represented by drawing a straight line and designating the endpoints with either an open or closed circle. An empty circle indicates that the value is not included. A closed circle indicates that the value is included.
Given the inequality a < 3.
This means that the value of a is less than three and does not include three.
Therefore we use an open circle on 3 and all the numbers to the left of 3 in the number line will be the values of a.
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I NEED HELP!!!!!!
Workers install 840 chairs at a constant rate. After 5 days, the workers still have to install 240 chairs. How much time does it take to install the chairs from start to finish?
Let's call the time it takes to install all the chairs from start to finish "t". The workers install 840 chairs per day, so in "t" days they will have installed 840 * t chairs.
At the end of 5 days, they still have 240 chairs to install, so they have installed 840 * 5 chairs so far. We can use this information to write an equation:
840 * t - 840 * 5 = 240
Expanding and simplifying the equation gives us:
840t - 4200 = 240
Adding 4200 to both sides gives us:
840t = 4440
Finally, dividing both sides by 840 gives us:
t = 5.2857142857...
So it takes approximately 5.29 days to install all the chairs from start to finish.
The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39. 48, 56, 95, 81 and 75. Find the
Range of the marks obtained
Mean marks obtained by the group
Answer: To find the range of the marks obtained, we need to find the difference between the highest and lowest marks:
Range = highest mark - lowest mark
To find the highest and lowest marks, we can simply sort the marks in ascending or descending order:
39, 48, 56, 75, 76, 81, 85, 85, 90, 95
So, the highest mark is 95 and the lowest mark is 39. Then, the range is:
Range = 95 - 39 = 56
To find the mean marks obtained by the group, we need to add up all the marks and divide by the number of marks:
Mean = (85 + 76 + 90 + 85 + 39 + 48 + 56 + 95 + 81 + 75) / 10
= 745 / 10
= 74.5
So, the mean marks obtained by the group is 74.5.
Step-by-step explanation:
What is the value of x for each question? Step by step please.
-1/2-4x/5=1/2-2x
7x²+9x²=-6x²-7x
-7x²+6=x²-7x²
Answer:
-1/2-4x/5=1/2-2x
Starting from the left side, we can simplify:
-1/2 - 4x/5 = 1/2 - 2x
Next, we can isolate x by adding 2x to both sides:
-1/2 - 4x/5 + 2x = 1/2 - 2x + 2x
-1/2 + 2x/5 = 1/2
Adding 1/2 to both sides:
0 + 2x/5 = 1
Finally, solving for x:
2x/5 = 1
Multiplying both sides by 5:
2x = 5
Dividing both sides by 2:
x = 5/2
7x² + 9x² = -6x² - 7x
Combining like terms:
16x² = -6x² - 7x
Adding 6x² to both sides:
22x² = -7x
Dividing both sides by -7:
-22x²/-7 = 7x/-7
-22x²/7 = -7x/7
-22x²/7 = -x
Multiplying both sides by -7:
22x² = x
Dividing both sides by 22:
x² = x/22
Since this equation states that x² equals x divided by 22, it has no real solutions for x.
-7x² + 6 = x² - 7x²
Combining like terms:
-8x² + 6 = 0
Adding 8x² to both sides:
-8x² + 8x² + 6 = 0 + 8x²
6 = 8x²
Dividing both sides by 8:
6/8 = 8x²/8
3/4 = x²
Taking the square root of both sides:
sqrt(3/4) = sqrt(x²)
x = +/- sqrt(3/4)
1. Completeby Filling >, < 0r= 9 10 19 20
The expression when completed is 0.9 [<] 0.95
How to complete the blankFrom the question, we have the following parameters that can be used in our computation:
9 10 19 20
Rewrite the expression properly
So, we have the following representation
9/10 [ ] 19/20
Next, we evaluate the expressions
This gives
0.9 [ ] 0.95
0.9 is less than 0.95
So, we have
0.9 [<] 0.95
The above represents the complete statement
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a farmer measures the height of every tree in a large orchard in centimeters. the farmer wishes to present the data by grouping the results into groups of 25 cm. which graphical display would be most appropriate to display the results?
A histogram would be the most appropriate graphical display to present data by grouping the results into groups of 25 cm.
A histogram is a graphical representation of data that shows the distribution of a set of continuous data by dividing the data into bins (or intervals) and showing the frequency of observations within each bin. The histogram provides a visual representation of the distribution of data, showing the shape, central tendency, and spread of the data.
In this case, the farmer has measured the height of every tree in a large orchard in centimeters and wants to present the data in groups of 25 cm. To create a histogram for this data, the first step would be to divide the data into bins, or intervals, of 25 cm.
Once the bins are created, the next step is to count the number of observations (tree heights) that fall within each bin. This information can be represented as a bar graph, where the height of each bar represents the frequency of observations within the corresponding bin.
By presenting the data in this way, the farmer can easily see the distribution of tree heights in the orchard. The shape of the histogram can indicate whether the data is symmetrical, skewed, multimodal, or uniform.
The central tendency of the data can be determined by looking at the peak of the histogram, which represents the most frequent range of tree heights. The spread of the data can be determined by looking at the width of the histogram and the range of tree heights represented.
In conclusion, a histogram is the most appropriate graphical display to present the results of the tree heights in groups of 25 cm because it provides a visual representation of the distribution of the data and allows the farmer to see the shape, central tendency, and spread of the tree heights in the orchard.
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how much does 3.26 m of lace cost if 0.8m costs $5.60?
PLEASE ANSWER IMAGINE BELOW I NEED THE ANSWER IN 5 MINS PLEASEE
two factors of 30 that are prime numbers
2 , 3, 5 all are that prime of 30
5×6
a heavy rope, 90 ft long and weighing 72 lbs, hangs over the edge of a building 100 ft high. how much work w is done in pulling the rope up 10 ft?
The work done in pulling the rope up 10 ft is 864 ft-lbs, calculated by multiplying the rope's weight (72 lbs) by the distance (10 ft) it was lifted.
Work done = Weight x Distance
Work done = 72 lbs x 10 ft
Work done = 720 ft-lbs
Additional work done for weight of rope = Weight of rope x Distance
Additional work done for weight of rope = 90 x 10
Additional work done for weight of rope = 900 ft-lbs
Total work done in pulling the rope up 10 ft = 720 ft-lbs + 900 ft-lbs
Total work done in pulling the rope up 10 ft = 864 ft-lbs
The work done in pulling the rope up 10 ft is calculated by multiplying the weight of the rope (72 lbs) by the distance (10 ft) it was lifted. This gives us a result of 720 ft-lbs. However, since the rope is 90 ft long, we must also take into account the additional weight of the rope beyond the 10 ft that was lifted. So, we multiply the weight of the rope (90 lbs) by the distance (10 ft) to get an additional work done of 900 ft-lbs. Adding the two results together gives us 864 ft-lbs of work done in pulling the rope up 10 ft. This shows that the heavier a rope is, the more work must be done to lift it.
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identify the zeros and asymptotes of
f(x)=
X²-9
x²-16
The zeros of f(x)= x²-9 is +3 and -3
The zeros of f(x) = x²-16 is +4 and -4
What are zeros and asymptotes?An asymptote is a line that the graph of a function approaches as either x or y go to positive or negative infinity. There are three types of asymptotes: vertical, horizontal and oblique. Vertical Asymptotes.
The zeros of a function are defined as the values of the variable of the function such that the function equals 0.
Therefore when f(x) =0
x²-9 = 0
x² = 9
x =√9
x = ±3
therefore the zeros of x²-9 is ±3
The vertical asymptote is 0 and horizontal asymptote is infinity.
x²-16 = 0
x² = 16
x = √16
x = ±4
the vertical asymptote is 0 and horizontal asymptote is infinity.
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When Cheryl’s phone battery is 55% charged, she knows it will last for another 1.5 hours. If Cheryl’s phone battery loses its charge at a constant rate, how long, in hours, will it last when it is fully charged?
Create a proportion using the given information to determine how long it will take for Cheryl's phone battery to totally drain. Total time divided by the remaining charge's percentage equals the remaining time (total charge)
What battery loses its charge at a constant rate?Enter these values because Cheryl is aware that the battery will continue to operate for 1.5 hours at a 55% charge. 1.5 / 0.55 = (total time) / 1 = (total time) / (total charge) (amount of time left) / (remaining percentage of the charge)
When we calculate the total amount of time, we get:
Time: 2.727 hours (1.5 / 0.55 × 1) * 1
To determine how long the battery will survive after fully charged, we may simply reverse the rate of discharge:
Total time / Total charge / (time left) / 1 = Total time / 100 (time left) = Total time / 100 (time left) (percent charge remaining)
The battery's lifespan after being completely charged is as follows:
(Total time) / 100 divided by the remaining time gives us 2.727 / 100 or 0.02727 hours.
As a result, after 1.64 minutes, or 0.02727 hours, Cheryl's phone battery will be fully charged.
Therefore, It takes 2.727 hours for Cheryl's phone battery to totally drain at a constant rate.
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