1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
wolverine [178]
3 years ago
15

What is this "√", called?

Mathematics
2 answers:
MissTica3 years ago
8 0
A Square Root is something you would in mathmatics. Like the square root of 49 is 7. Its just doubles 7x7 equal 49. 8x8 is 64 so the square root of 64 is 8.
Katyanochek1 [597]3 years ago
6 0

That is called square root


You might be interested in
Let X1 and X2 be independent random variables with mean μand variance σ².
My name is Ann [436]

Answer:

a) E(\hat \theta_1) =\frac{1}{2} [E(X_1) +E(X_2)]= \frac{1}{2} [\mu + \mu] = \mu

So then we conclude that \hat \theta_1 is an unbiased estimator of \mu

E(\hat \theta_2) =\frac{1}{4} [E(X_1) +3E(X_2)]= \frac{1}{4} [\mu + 3\mu] = \mu

So then we conclude that \hat \theta_2 is an unbiased estimator of \mu

b) Var(\hat \theta_1) =\frac{1}{4} [\sigma^2 + \sigma^2 ] =\frac{\sigma^2}{2}

Var(\hat \theta_2) =\frac{1}{16} [\sigma^2 + 9\sigma^2 ] =\frac{5\sigma^2}{8}

Step-by-step explanation:

For this case we know that we have two random variables:

X_1 , X_2 both with mean \mu = \mu and variance \sigma^2

And we define the following estimators:

\hat \theta_1 = \frac{X_1 + X_2}{2}

\hat \theta_2 = \frac{X_1 + 3X_2}{4}

Part a

In order to see if both estimators are unbiased we need to proof if the expected value of the estimators are equal to the real value of the parameter:

E(\hat \theta_i) = \mu , i = 1,2

So let's find the expected values for each estimator:

E(\hat \theta_1) = E(\frac{X_1 +X_2}{2})

Using properties of expected value we have this:

E(\hat \theta_1) =\frac{1}{2} [E(X_1) +E(X_2)]= \frac{1}{2} [\mu + \mu] = \mu

So then we conclude that \hat \theta_1 is an unbiased estimator of \mu

For the second estimator we have:

E(\hat \theta_2) = E(\frac{X_1 + 3X_2}{4})

Using properties of expected value we have this:

E(\hat \theta_2) =\frac{1}{4} [E(X_1) +3E(X_2)]= \frac{1}{4} [\mu + 3\mu] = \mu

So then we conclude that \hat \theta_2 is an unbiased estimator of \mu

Part b

For the variance we need to remember this property: If a is a constant and X a random variable then:

Var(aX) = a^2 Var(X)

For the first estimator we have:

Var(\hat \theta_1) = Var(\frac{X_1 +X_2}{2})

Var(\hat \theta_1) =\frac{1}{4} Var(X_1 +X_2)=\frac{1}{4} [Var(X_1) + Var(X_2) + 2 Cov (X_1 , X_2)]

Since both random variables are independent we know that Cov(X_1, X_2 ) = 0 so then we have:

Var(\hat \theta_1) =\frac{1}{4} [\sigma^2 + \sigma^2 ] =\frac{\sigma^2}{2}

For the second estimator we have:

Var(\hat \theta_2) = Var(\frac{X_1 +3X_2}{4})

Var(\hat \theta_2) =\frac{1}{16} Var(X_1 +3X_2)=\frac{1}{4} [Var(X_1) + Var(3X_2) + 2 Cov (X_1 , 3X_2)]

Since both random variables are independent we know that Cov(X_1, X_2 ) = 0 so then we have:

Var(\hat \theta_2) =\frac{1}{16} [\sigma^2 + 9\sigma^2 ] =\frac{5\sigma^2}{8}

7 0
3 years ago
Answer this for points and brainilest (work must be included)
marin [14]

Answer:

4

Step-by-step explanation:

4b + 5 = 1 + 5b

4 = 1b

4 = b

4 0
2 years ago
Write in Slope-intercept Form an equation of the line that passes through the given points.
serious [3.7K]

Answer:

Step-by-step explanation:

Slope =(x2-x1/y2-y1)

=(3-7/2+3)

-4/5

slope =-4/5

3 0
2 years ago
Identify the phase shift of each function. Describe each phase shift use a phrase like 3 units to the left
melisa1 [442]

Answer:

It moves horizontally 1/2 units to the left

It moves vertically 2 units up

Step-by-step explanation:

∵ y = Acos(Bx - C) + D

∵ y = 2 - 3cos(2x + 1)

∴ The phrase of shift:

∵ The horizontally shift is -C/B = - 1/2 = -1/2

∴ It moves 1/2 units to the left

∵ The vertically shift is D

∴ It moves 2 units up

7 0
3 years ago
Each side of a square classroom is 8 meters long. The school wants to replace the carpet in the classroom with new carpet that c
son4ous [18]
Because a square has 4 sides, you would multiply the 8 meters by 4. That would mean that the entire room is 32 squared meters. Then multiply the 32 meters by the cost ($35.00). The total cost of the new carpet is $1,120
5 0
2 years ago
Other questions:
  • What is 7/9 as a decimal terminating or repeating decimal
    9·1 answer
  • How would you type out how you showed your work
    11·2 answers
  • What is 2,767,545 to the nearest ten
    6·1 answer
  • Please helppp meee ill give you Brainly
    9·1 answer
  • What is the solution to the division problem below? (You can use long division or synthetic division)
    10·1 answer
  • Ben bought 1/2 pound of cheese for 3 sandwiches. If he puts the same amount of cheese on each sandwich, how much cheese will eac
    9·2 answers
  • 100 points + brainlest please help due today
    10·1 answer
  • Square root of 49/64 answered as a fraction
    11·1 answer
  • The nearest ten 1202(38)
    14·1 answer
  • Sales tax for an item was 13.80$ and it cost 460$ before tax. Whats the sale tax rate in percentage?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!