The mean of the stock's returns over the past 3 years minus the sample standard deviation of the stock's returns from the past 3 years is -6.54
What is the standard deviation?
A standard deviation is a measurement of the data's dispersion from the mean. Data are grouped around the mean when the standard deviation is low, and are more dispersed when the standard deviation is high.
Standard deviation It is a measure of how spread out numbers are. It is the square root of the Variance, and the Variance is the average of the squared differences from the Mean.
Mean :
Mean = [10+3 + (-7) ] / 3 = 2
sample standard deviation :
subtract the mean from each data element.
10- 2 = 8
3-2 = 1
-7 - 2 = -9
Square those numbers.
8² = 64
1² = 1
(-9)² = 81
Add those
64+1+81 = 146
Divide by (number of elements -1 = 3 -1 = 2)
146/2 = 73
Take square root
8.54
So, the sample standard deviation = 8.54
The mean of the stock's returns over the past 3 years minus the sample standard deviation of the stock's returns from the past 3 years
= 2 - 8.54
= -6.54
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when the null hypothesis is rejected, it is possible a type ii error has occurred. not possible a type i error has occurred. possible a type i error has occurred. possible either a type i or a type ii error has occurred.
When the null hypothesis is rejected possible a Type i error has occurred.
Let's Understand what is null hypothesis?
A statistical hypothesis known as a null hypothesis asserts that no statistical significance can be found in a set of provided observations. Using sample data, hypothesis testing is used to judge a hypothesis' veracity. It is sometimes referred to as just "the null" and its symbol is [tex]H_{0}[/tex].
We have total 4 cases:
[tex]H_{0}[/tex] accepted when [tex]H_{0}[/tex] is true -> Correct decision
[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is true -> Type i Error when null hypothesis is present and we have rejected
[tex]H_{0}[/tex] accepted when [tex]H_{0}[/tex] is false -> Type ii Error when null hypothesis is not present but we have accepted
[tex]H_{0}[/tex] rejected when [tex]H_{0}[/tex] is false -> Correct decision.
So according to question null hypothesis is rejected so we have two options Either Null hypothesis is present or not present.
if it is present then it is Type i Error.
if it is not present then it is Correct decision.
So when the null hypothesis is rejected possible a Type i error has occurred.
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Unit 5 relationships with triangle homework3
3456
Step-by-step explanation:
2x2=4 3456 67867789990
(1 point) some shrubs have the useful ability to resprout from their roots after their tops are destroyed. fire is a particular threat to shrubs in dry climates, as it can injure the roots as well as destroy the aboveground material. one study of resprouting took place in a dry area of mexico. the investigation clipped the tops of samples of several species of shrubs. in some cases, they also applied a propane torch to the stumps to simulate a fire. of 14 specimens of a particular species, 6 resprouted after fire. estimate with 95% confidence the proportion of all shrubs of this species that will resprout after fire.
With a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.
What is a confidence interval?
An area surrounding a measurement that indicates how accurate it is called a confidence interval.
Here, we have
Confidence interval is written as
Sample proportion ± margin of error
Margin of error = z × √pq/n
Where
z represents the z score corresponding to the confidence level
p = sample proportion. It also means the probability of success
q = probability of failure
q = 1 - p
p = x/n
Where
n represents the number of samples
x represents the number of success
From the information given,
n = 14
x = 6
p = 6/14 = 0.42
q = 1 - 0.42 = 0.58
To determine the z score, we subtract the confidence level from 100% to get α
α = 1 - 0.95 = 0.05
α/2 = 0.05/2 = 0.025
This is the area in each tail.
Since we want the area in the middle, it becomes
1 - 0.025 = 0.975
The z score corresponding to the area on the z table is 2.05. Thus, Thus, the z score for a confidence level of 95% is 1.96
Therefore, the 95% confidence interval is
0.42 ± 1.96√(0.58)(0.42)/14
The lower limit of the confidence interval is
0.42 - 0.25 = 0.17
The upper limit of the confidence interval is
0.42 + 0.25 = 0.67
Hence, with a 95% confidence interval, the proportion of all shrubs of this species that will resprout after a fire is between 0.17 and 0.67.
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suppose you live on the moon. how long is a day (i.e., from sunrise to sunrise)? a) 23 hours 56 minutes b) 24 hours c) a lunar month d) a year e) about 18 years
If we live on the moon, a day on the Moon is about a lunar month long
The correct answer is an option (c)
We know that a day is the length of time between two noons or sunsets. A day is of 24 hours on Earth and 708.7 hours (which is 29.53 Earth days) on the moon.
We know that a lunar month is nothing but the time the Moon takes to go around the Earth.
A lunar month is of approximately 29.53 days.
This means, a day on the Moon is about a lunar month.
Therefore, a day on the Moon is of 708.7 hours i.e., about a lunar month.
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What horizontal distance did the ball travel before it hit the ground?
Answer:
21 meters
Step-by-step explanation:
you can see it goes 21 meters before it hits the ground
Answer:
21 is the answer
a single die is rolled twice. find the probability of getting a 3 the first time and a 3 the second time.
The probability of rolling a 3 the first time and a 3 the second time is 1/36.
Given that,
There are two rolls of one die.
We have to determine the probability of receiving a 3 both the first and second times.
We know that,
There are 6 faces on a die.
Of these 6 faces, one of them is 3 and one of them is 3
So, the probabilities of rolling a 3 and a 3 are:
P(3) = 1/6
P(3) = 1/6
The probability of rolling a 3 the first time and a 3 the second time is calculated as follows:
Pr=P(3)×P(3)
This gives
Pr=1/6×1/6
Multiply
Pr=1/36
Therefore, the probability of rolling a 3 the first time and a 3 the second time is 1/36.
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in the stock market, changes in value used to be indicated by fractions, which represented portions of $1. if a stock had a value of $11.50, write and evaluate an addition expression to find how much the stock is worth after an increase of 1/4
The worth of the stock after the increase is $14.375.
What is an expression?Expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both. Addition, subtraction, multiplication, and division are all possible mathematical operations.
Based on the information given, the addition expression will be:
= Original value + Increase
= $11.50 + (1/4 × $11.50)
= $11.50 + $2.875
= $14.375
The value is $14.375.
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A distribution has a mean of 16 and a standard deviation of 6. What is the z score that corresponds with 25?.
Using the normal distribution formula, we know that the z score that is equivalent to 25 is 1.5.
What is a normal distribution?A continuous probability distribution for a real-valued random variable in statistics is known as a normal distribution or Gaussian distribution.
The characteristics of normal distributions are as follows: Bell-like in its symmetry.
The distribution's mean and median, which are both at its center, are equal.
68 percent of the data, or approximately, falls within one standard deviation of the mean.
So, the formula is used to determine the Z score for a data point x in a normal distribution:
Z = z - mean/standard deviation
Now, use the formula to calculate the z value as follows:
Z = z - mean/standard deviation
Z = 25 - 16/6
Z = 9/6
Z = 3/2
Z = 1.5
Therefore, using the normal distribution formula, we know that the z score that is equivalent to 25 is 1.5.
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between 1998 and 2018, the proportion of adults who meet the weekly goal of 150 minutes of moderate exercise or 75 minutes of intense exercise has by percent.
The weekly goal of 150 minutes of moderate exercise or 75 minutes of intense exercise has increased by 22.9 percent.
The intensity of exercises depends on mostly the amount of energy you have to spend. But the time spent also differs. Intense exercises are basically exercises that require you to expend more energy than how much you spend on normal exercise. Any exercise becomes intense when you spend 70 to 85 percent of your maximum heart rate working out. It is vigorous but you get the same amount of calories burned.
Moderate exercises are the normal ones. These require normal intake of heart rate and energy but take more time. The walk from your house to your college/school or the normal crunches and all you do are perfect examples of moderate exercises.
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4. ¿Por qué al colocar un vaso lleno sobre un papel y tirar con fuerza de éste, el vaso no se mueve?
Answer: The glass of water has inertia
Step-by-step explanation: The trick works no matter how heavy an object is since friction is weaker for lighter objects. Provided you pull quickly enough, this trick can even be done with glasses or plate
As a club fundraiser, a group of students washed 40 cars one weekend. The next weekend, they washed 70 cars. what was the percent increase in the number of cars washed
Answer:
15%
Step-by-step explanation:
i hope i got this right
Answer:
15% is the answer to your question
A field measures 40 by 80 yards. Larysa makes a scale drawing with a scale of 1 in. to 5 yd., and Prakash makes his own scale drawing with a scale of 1 in. to 8 yd. Whose drawing has a larger area? Explain your reasoning.
Answer:
larysa got a larger drawing because 1 in 5 is bigger then 1 in 8 yards so that makes her area way larger
The wholesale price of a TV is $650. The store markup is 15%. What is the retail price of the TV?
Answer:
$747.50
Step-by-step explanation:
x^2 + 4x + y^2 - 4y - 28= 0
I don't know for certain if you are trying to write this in standard form, graph it, or so forth. However, here is the standard form.
Standard Form:
[tex](x+2)^2+(y-2)^2=36\\[/tex]
Hope this helps you!
-Snow skis were first used in northern Europe and Asia thousands of
from the bones of large animals
years ago. They were probably (18)
and strapped with strips of leather to the boots of skiers. These primitive
skis were used primarily on flat ground as a means of traveling from one
(19) for rapid
place to another. The loose bindings made them too
downhill movement. Not until the development of better skis, more secure
(20) as a
19
fastening methods, and ski lifts did skiing attain
recreational and competitive sport.
18 F diverted
G dissected
H fashioned
J manufactured
A annoying
B laborious
C precarious
D inaccurate
20 F projection
G productivity
H perspective
J prominence
Answer:
no
Step-by-step explanation:
Hi pls help me
Answer also the 3 questions
Step-by-step explanation:
the table was filled correctly already by somebody yesterday.
the important thing to remember is that an arc angle is always measured at the center point of the circle. that is the difference to angles between the intersecting lines of arc segments.
it would be really important that you start doing these things yourself. this hands-on experience of these (really basic) questions is designed to help you get a feeling how these things work together, which makes later topics much easier for you.
please tell me what you don't understand here. you only need to apply common sense. no magic voodoo math formulas or strategies.
FAR = 100° FR = 140° VO = 60° FR+VO = 200°
FAV = 80° FV = 60° RO = 100° FV+RO = 160°
OAV = 100° VO = 60° FR = 140° VO+FR = 200°
OAR = 80° RO = 100° FV = 60° RO+FV = 160°
how did we get the measures of the intercepted arcs ? by counting the 20° segments on the arc. the full circle arc represents 360°. always, for every circle. one time around is one time around and therefore 360°, no matter the size of the circle.
when you stand directly on the south pole of the Earth for 24 hours, you will have rotated the full 360° in that time (one rotation per day). if you stand on the equator for 24 hours, the Earth has taken you on one spin of the full 360°. the difference is the absolute arc length and the necessary speed at which we cover the distance of a full arc length.
every 250 million years our whole sogar system rotates once (by the full 360°) around the center of our galaxy.
the degrees have nothing to do with radius, diameter, area, ... of a circle. only with the relative parts of the circumference. when the minute arm of a clock moved for 15 minutes, then it went 90° around the clock's face. after 60 minutes it went the full 360°, and the cycle starts anew.
so, minutes on a clock or hours of the day are just another way of counting degrees around a circle.
what have we noticed with the sum of the measures of the intercepted arcs ?
many things.
e.g.
they are exactly twice as large as the line angles. 100 to 200. 80 to 160.
the sum of 2 pairs of opposing arc angles is always 360°.
...
so, how will we get the line angles based on the sum of the angles of the intersected arcs ?
we cut the sum of the intersected arc angles in half. 200 to 100. 160 to 80.
Simplify the following by applying the laws of exponents.
Expression [tex]\frac{x^7y^5}{x^2y^3}[/tex] can be simplified as x⁵y² by applying laws of components.
What is an algebraic expression?An algebraic expression is consists of variables, numbers with various mathematical operations,
The given expression is,
[tex]\frac{x^7y^5}{x^2y^3}[/tex]
Simplify the expression by using law of exponents [tex]a^n/a^m =a^{(n-m)[/tex],
The expression can be rewritten as,
= [tex]x^{(7-2)}{y^{(5-3)}[/tex]
= x⁵ y²
The expression can be simplified as x⁵y².
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Given 29 213.
Which lines, if any, must be parallel based on the given
information? Justify your conclusion.
c|d, Converse of the Same-Side Interior Angles
Theorem
a | b, Converse of the Alternate Interior Angles
Theorem
c|| d. Converse of the Corresponding Angles
Theorem
not enough information to make a conclusion
Answer:
has to be c other wise it would make sense
Find the values of the variables in each parallelogram
Adjacent angles of a parallelogram are supplementary.
[tex]y+3y=180 \\ \\ 4y=180 \\ \\ y=\boxed{45} \\ \\ \\ \\ 3(45)+3x=180 \\ \\ 45+x=60 \\ \\ x=\boxed{15}[/tex]
I REALLY NEED HELP PLEASEE
The action of a waterwheel can be modeled by the function y = 3 cos (π (x-3) + 2).
Within the interval 0
that value?
Answer:
y = 3 cos (π (0-3) + 2)
y = 3 cos (-2π + 2)
y = 3 cos (-2)
y = 3(-1)
y = -3
what fraction is exactly between 4/7 and 3/5
Answer:41/60
Step-by-step explanation:
3/5 and 4/7 can also be expressed as 21/30 and 20/30 respectively.
(7 and 5 have a common multiple of 30) if you multiply both of these by 2/2 (aka 1) then you get 42/60 and 40/60 respectively.
In between these 2 fractions is 41/60.
A student wants to compare textbook prices for two online bookstores. She takes a random sample of five textbook titles from a list provided by her college bookstore, and then she determines the prices of those textbooks at each of the two websites. The prices of the five textbooks selected are listed below in the same order for each online bookstore. com: $115, $43, $99, $80, $119 com: $110, $40, $99, $69, $109 Are these independent or dependent samples? Dependent. Different textbooks are being compared. Dependent. The same textbooks are being compared. Independent. Different textbooks are being compared. Independent. The same textbooks are being compared. To construct a confidence interval, the data must be checked for outliers. (Is it reasonable to assume that the data came from a normal population?) Which variable should be checked? the prices of textbooks from B.com the difference between the average textbook price for A.com and the average textbook price for B.com the difference between the textbook price from A.com and the textbook price from B.com for each textbook, the prices of textbooks from A.com Find a 96% confidence interval for the mean difference in textbook prices at the two online bookstores. (Use d = A.com - B.com.) (Use 3 decimal places)
A 96% confidence interval for the mean difference in textbook prices at the two online bookstores is (3.22,8.38).
What is a confidence interval?
An estimated range for an unknown parameter is known as a confidence interval. The 95% confidence level is the most popular, however other levels, such as 90% or 99%, are occasionally used when computing confidence intervals.
Here, we have
The mean and standard deviation are M = 5.8 and s = 4.658
To calculate the estimated standard error, we apply
S = [tex]\sqrt{s^2/n}[/tex]
=[tex]\sqrt{4.658^2/5}[/tex]
= 2.08
The 96% confidence interval is :
CI = x ±t₉₆s/√n
= 5.8 ±2.7764× 2.08/√5
= 5.8±2.58
= (3.22,8.38)
Hence, a 96% confidence interval for the mean difference in textbook prices at the two online bookstores is (3.22,8.38).
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place the flags 1 standard deviation on either side of the mean. what is the area between these two values? what does the empirical rule say this area is?
The area between one standard deviation and either side of mean is 34%
The empirical rule, also referred to as the three-sigma rule or 68-95-99.7 rule, is a statistical rule which states that for a normal distribution, almost all observed data will fall within three standard deviations (denoted by σ) of the mean or average (denoted by µ).
In particular, the empirical rule predicts that 68% of observations falls within the first standard deviation (µ ± σ)
95% within the first two standard deviations (µ ± 2σ)
99.7% within the first three standard deviations (µ ± 3σ).
According to the question,
If we place the flag 1 standard deviation on either side of the mean
which means flag is placed either on (µ + σ) or ( (µ - σ)
and Using Empirical rule,
68% of area lie under (µ ± σ)
Therefore , Area between either (µ + σ) or ( (µ - σ) = 68 / 2
=> 34%
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Explain in detail with at least two sentences how to graph the complex number z = 3-5i in the complex
plane
A complex number is represented on a complex plane. The number [tex]z = 3-5i[/tex] is represented in a smilar manner as real numbers but y axis cosidered a imaginary axis.
What is a complex plane?
A complex plane is formed by complex numbers in a similar manner as the Cartesian coordinate system. But the x axis is made up of real numbers and y axis is made up of imaginary numbers.
A complex number is plotted on a complex plane. In the complex plane the x axis is known as the real axis and the y axis is known as the imaginary axis.
Consider the given complex number.
[tex]z = 3-5i[/tex]
Here, 3 is real number and -5 is imaginary number.
Since 3 is real number hence, move 3 steps in the right direction on x axis. Now, -5 is the imaginary number hence, move 5 steps in the downward direction parallel to the y axis.
The final position is [tex]z = 3-5i[/tex].
Hence, a complex number is represented on a complex plane.
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solve please i'm desperate
Answer:
-4/5 (fraction)
Step-by-step explanation:
add the numbers:
25x^2-16=0
use quadratic formula
simplify -40/50
-4/5
Write the equation of the line that passes through the points (7, 8) and (-4, 9). Put
your answer in fully simplified point-slope form, unless it is a vertical or horizontal
line.
Answer:
y - 8 = -1/11(x - 7)
Step-by-step explanation:
GIVING BRAINLIEST!!!!!!!!!
Fill in the blank with the correct response. What is the scale factor? RST ~ MNO?
RST = 3, 5.5
MNO= 6 , X
what is the scale factor?
The scale factor is 2 if the two triangles are similar to each other after applying the property of a similar triangle.
What is a scale factor?The ratio among comparable dimensions of an object and a model with that object, known as an exponent in algebra. The replica will be larger if the scale factor is a whole number. The duplicate will be lowered if the step size is a fraction.
It is given that:
Two triangles are shown in the picture
From the definition of the similar triangle.
Scale factor = 6/3 = 2
Thus, the scale factor is 2 if the two triangles are similar to each other after applying the property of a similar triangle.
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Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Find the probability of exactly eight boys in ten births.
There is a 0.044% probability of having exactly 8 boys in a sample of 10 births.
What is probability?
Simply put, the probability is the likelihood that something will occur.
When we don't know how an event will turn out, we can discuss the likelihood or likelihood of several outcomes.
Statistics is the study of events that follow a probability distribution.
For instance, there is only one way to receive a head and there are a total of two possible outcomes, hence the probability of flipping a coin and getting heads is 1 in 2 (a head or tail).
P(heads) = 1/2 is what we write.
So, X is the proportion of boys among n particular births. Let p represent the likelihood of having a boy at a certain birth.
Here n=10.
Additionally, because male and female births are equally likely, there is a 50% chance of having a boy or a girl.
P(Boy) = P(girl) = 0.5
p = 0.5
Based on the information provided, there will be a defined number of trials (n) of 10, with a constant chance of success (p).
Furthermore, every trial stands alone from the others.
So, with n=10 and p=0.5, X follows a binomial distribution.
The following is the probability function of the binomial distribution for the k number of successes, where x = k.
[tex]\mathrm{P}(\mathrm{X}=\mathrm{k})=(10 C k) 0.5^k(1-0.5)^{10-k}[/tex]
Finding the likelihood of 8 boys in n=10 births is necessary.
P(X=8) = (10C8)0.5⁸(1-0.5)¹⁰⁻⁸
= 45 × 0.0039 × 0.25
P(X = 8) = 0.0438
Therefore, there is a 0.044% probability of having exactly 8 boys in a sample of 10 births.
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3. AABC AEFG, mZA = 25°, and m/F = 100°.
What is m/C?
A. 125°
B. 100°
C. 55°
D. 25°
Answer: A
Step-by-step explanation: To solve this problem, we need to use the properties of triangles and the given information to determine the measure of angle C.
First, we can use the fact that angle A is opposite angle C to deduce that angles A and C are congruent (i.e. they have the same measure). This means that the measure of angle C is 25 degrees.
Next, we can use the fact that triangle AABC is isosceles (i.e. it has two sides of equal length) to deduce that angle B is also 25 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle A is 25 degrees and angle C is 25 degrees, then the remaining angle, angle B, must be 180 - (25 + 25) = 130 degrees.
We can also use the fact that triangle AEFG is isosceles to deduce that angle F is also 100 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, so if angle E is 100 degrees, then the remaining angle, angle F, must be 180 - 100 = 80 degrees.
Finally, we can use the given information that the measure of angle Z is 25 degrees and the measure of angle F is 100 degrees to deduce that the measure of angle X is 180 - (25 + 100) = 55 degrees. This is because the sum of the interior angles of a triangle is 180 degrees, and we have already determined the measures of two of the angles (angles Z and F).
Therefore, the measure of angle C is 25 degrees, which means the correct answer is A) 125 degrees.