Which of the following is the necessary condition for creating confidence intervals for the population mean? A. Known population parameter B. Normality of the population C. Known standard deviation of the estimator D. Normality of the estimator (e.g., sample mean)

Answer:

Your answer should be x = 2

Step-by-step explanation:

149 + 13(2) + 5 = 180.

Hope this helps.

Answer:

x=2

Step-by-step explanation:

You add 149 and 5, which is 154. Then you take the total which is 180, and subtract it by 154. So 180-154=26 Then you take and do 26/13 which is 2.

149+13(2)+5=180

149+26+5=180

Definitely 2.

Hope this helps!!!

The value of y coordinate of the unit circle is given by [tex]\sqrt{7}/4[/tex]

Given that,

x - coordinate of p =-3/4 . Let the co-ordinate of point P = (-3/4 , y).

To find : The y coordinate in Quadrant IV

By using the formula for unit circle,

Unit circle means a circle whose radius is one or 1

x²+ y² = 1

y²+ (-3/4)² = 1

y²+ (9/16) = 1

y² = 1 -9/16

y² = 7/16

y= [tex]\sqrt{7/16}[/tex]

y =  ± [tex]\sqrt{7}/4[/tex]

It is given that point P is in quadrant IV so in IV quadrant y is positive.

Therefore, y =  [tex]\sqrt{7}/4[/tex]

Learn more about y coordinate :

brainly.com/question/27749090

#SPJ4

Answer:

Step-by-step explanation:

It A (x,y) (0.4x,0.4y)

The interpolations;

(a) 81st

= NORM.INV(0.81;0;1)

0.878

(b) 19th

=NORM.INV(0.19;0;1)

-0.878

(c) 76th

=NORM.INV(0.76;0;1)

0.706

(d) 24th

=NORM.INV(0.24;0;1)

-0.706

(e) 11th

=NORM.INV(0.11;0;1)

-1.227

Given,

Data near the mean are more likely to occur than data distant from the mean, according to the normal distribution, which is a probability distribution that is symmetric around the mean.

"A numerical measurement used in statistics of a value's relationship to the mean (average) of a set of values, assessed in terms of standard deviations from the mean," according to Wikipedia, is the Z-score.

For this case we can find the percentiles with the Norm.inv function in Excel and we got:

(a) 81st

= NORM.INV(0.81;0;1)

0.878

(b) 19th

=NORM.INV(0.19;0;1)

-0.878

(c) 76th

=NORM.INV(0.76;0;1)

0.706

(d) 24th

=NORM.INV(0.24;0;1)

-0.706

(e) 11th

=NORM.INV(0.11;0;1)

-1.227

Learn more about interpolations here;

https://brainly.com/question/15113672

#SPJ4

8.1^4 x 8.1^8 will be equal to 8.1^12. But, 8.1^12 will not be equal to 8.1^6.

Some laws of exponents are:

We are given:

8.1^4 x 8.1^8

We need to check if 8.1^4 x 8.1^8 be equal to 8.1^12 and if 8.1^12 be equal to 8.1^6.

We will use laws of exponents to solve the given expression:

8.1^4 x 8.1^8 = 8.1^(4 + 8) = 8.1^12

So, 8.1^4 x 8.1^8 = 8.1^12

Also,

8.1^12 = 8.1^(2 * 6) = (8.1^2)^6

So, 8.1^12 ≠ 8.1^6.

Thus, 8.1^4 x 8.1^8 will be equal to 8.1^12. But, 8.1^12 will not be equal to 8.1^6.

To learn more about laws of exponent visit:

brainly.com/question/28966438

#SPJ1

Percentage change expresses the ratio of the change in the amount of an initial quantity to the initial quantity as a percentage.

Mathematically, the formula for percentage change, C, can be presented as follows;

[tex]C = \dfrac{x_{2} - x_{1} }{ x_{1} } \times 100[/tex]

Where:C = The percentage change

[tex]x_{1} [/tex] = The original value

[tex]x_{2} [/tex] =The new value

Graphically, percentage change can be presented as follows;

When the number of fruits that drops from a three each month, changes from 10 to 8, the percentage change is therefore;

[tex] C = \dfrac{10-8}{10} = 20\% [/tex]The percentage change is 20%

Initial number of fruits that drops monthly from the tree;

##########

The new number of fruits that drops from the tree on the specified month;

########

The difference in the number of fruits that drops from the tree is 2, which corresponds to the 20 % calculated for the percentage change.

Learn more about the percentage change in an amount here:

https://brainly.com/question/12865932

#SPJ1

Answer:

3x7

Step-by-step explanation:

product is multiplication so 3x7 is only correct answer

Hopes this helps please mark brainliest

Answer:

8 hours

Step-by-step explanation:

2 cars will be $400 since 2x200=400

500-400=120

He made $120 from hours alone so now we divide by 15

120/15=8

He worked 8 hours

Hopes this helps please mark brainliest

The expression that represents the total number of illustrations in Julio's sketch pad after his museum visit is given as follows:

Total number = 20 + x.

The expression that represents the total number of illustrations in Julio's sketch pad after his museum visit is obtained adding the previous amount of illustrations to the number of illustrations that were added during the visit to the museum, hence:

Total number of illustrations = Previous number of illustrations + number of illustrations added during the visit.

In the context of this problem, the values of these parameters are given as follows:

Hence the expression is defined as follows:

Total = 20 + x.

More can be learned about the addition of two amounts at https://brainly.com/question/25421984

#SPJ1

First number 79 about friction is correct statement with initial velocity .

What is friction?

Friction is a force that opposes motion between any surfaces that are touching. Friction can work for us yet against of us .

It is the action of one surface or object rubbing against another .

According to the given question in this case force of friction has a tendency to rotate the cube in anticlock wise direction. So normal reaction will shift in forword direction to balance the force due to torque of friction.

Thus, During motion the normal reaction shift towards posetive x- axis from the centre of mass is correct.

To know more about friction click

https://brainly.com/question/24338873

#SPJ1

The set of probabilities for the number of eaglets is the

probabilities for how many eaglets will survive.

The table that shows the probability distribution is the option C;

X      0         1         2

p(x)   0.35   0.60   0.05

  P(O) = 0.5 is the likelihood that the elder eaglet will live.

  Therefore;

   P(O') = 1 - 0.5 = 0.5 is the probability that the older eaglet won't survive.

  The likelihood that the younger eaglet will survive if the older eaglet              does not P(Y|O) = 10%

Therefore;

The likelihood that the elder eaglet will live while the younger eaglet does not survive is P(Y'|O) = 1 - 10% = 90%.

When the older eaglet does not survive, the younger eaglet has a 30% survival chance (P(Y|O')).

Therefore;

The likelihood that the younger eaglet will not survive, compared to the elder eaglet, is P(Y'|O') = 1 - 30% = 70%

The collection of potential probabilities for the number of eaglets that survive is expressed as the probability distribution, or P(X)

The range of potential results includes:

Never survives:

The likelihood that no eaglets survive is equal to P(O') × P(Y'|O') = 0.5 × 0.7 = 0.35.

The only survivor is:

The likelihood that only one eaglet survives is determined by P(O) = P(Y'|O) × P(O') = P(Y|O'), which results in P = 0.5 × 0.9 + 0.5 × 0.3 = 0.6 Both survive:

The odds of both eaglets surviving are P(O) ×P(Y|O) = 0.5 × 0.1 = 0.05.

The table of the probability distribution is therefore;

X      0         1         2

p(x)   0.35   0.60   0.05

To learn more about Probability:

https://brainly.com/question/11234923

#SPJ4

Answer:

26

Step-by-step explanation:

you are given 45° and 90° so you know the third angle will also be 45° because the sum of all angles always is 180°
with all 3 angles you apply the sine law
a / sin( α ) = b / sin( β ) = c / sin( γ )
then you'll see that a = 26

The decimal that Juanita can use to update her report is 1.6.

A decimal is a number with a whole and a fractional part. Decimal numbers are between integers and represent numerical value for whole plus some fraction of a whole.

The decimal numeral system is the most widely used system for representing both integer and non-integer numbers. It is the Hindu-Arabic numeral system's extension to non-integer numbers. Decimal notation refers to the method of representing numbers in the decimal system.

In this case, the the pitcher threw a total of 384 pitches and used a fastball 240 times. The decimal will be:

= Number of throws / Fastball

= 384 / 240

= 1.6

The decimal is 1.6.

Learn more about decimals on:

https://brainly.com/question/1827193

#SPJ1

The confidence interval estimate is (6.41, 7.11) of the population mean rating for Miami

The question includes a sample of the data.

The sample size, n = 50

The sample mean:

x= ∑X /n

= 6.76

The sample standard deviation;

s= √∑(X-x)²/(n-1)

=2.55

The confidence level =0.95

The significance level , α = 0.05

The sample mean, X

= 6.76

The sample standard deviation, s = 2.55

The sample size , n= 50

Degree of freedoms :

Df = n-1

=49

Using the t-distribution table, the critical value of t is:

t critical = t α/2, df

= t 0.025,49

= 0.098

95% confidence interval :

μ =  X ± t.s/√n

 t.s /

= 6.76  2.01  2.55 / √50

= 6.76  0.7249

Therefore, The confidence interval is ( 6.41, 7.11)

Learn more about confidence interval here:

brainly.com/question/28280095

#SPJ4

The following are the answers:

23. The cost for 7 lessons is $82, and the cost of 11 lessons is $122, we have;

The total cost of lessons is;  f(x) = y = 10·x + 12 and one lesson costs $22

24. The equation of population of Laredo, Texas is :

p = 92500t/17 + 123000

25. The linear equation to represent the temperature T at an elevation of x, where x is in thousands of feet is T = -(2000/3)x + (4228/3).

26. The equation to represent the amount 'R' Natalia and her friends raised after selling 'c' cakes will be;

⇒ R = 4c

Given:

23. Lydia wants  to purchase guitar lessons.

7 lessons = $82

11 lessons = $122

we are asked to determine the linear equation which finds the total cost C for d lessons.

The general equation for the total cost of lessons is;

Let a represent the cost of 7 guitar lessons, and let b represent the cost of 9 guitar lessons, given that the cost increases linearly with the number of lessons, we have;

The cost increase per lesson = The slope of the linear function representing the total cost of a guitar lesson

Therefore,

slope = b-a/11-7 = b-a/4

Expressing the equation in slope and intercept form, we get:

(y-a) = b-a/4 . (x-7)

y = b-a/4 . x-7 × b-a/4 + a = b-a/4 . x + 11.a-7.b/4

y = b-a/4 . x + 11.a-7.b/4 = 1/4.((b-a).x+11.a-7.b

where a=$82 and b=$122 we ahve:

y = 1/4 . (122-82) . x+1/4 . (11×82-7×122) = 10x+12

The total cost of a lesson is:

y = 10×1+12

= 22

24. Given:

t = the number of years after 1990.

So, for 1990, t = 0. So the coordinate is (0, 123000).

For 2007, t = 17. So the coordinate is (17, 215500).

using point slope formula:

m = 215500-123000/17-0

m = 92500/17

⇒ p = 92500t/17 + 213000

25. The equation of a line in slope-intercept form is y = mx + b.

Where slope = m and b = y-intercept.

the slope is the rate of change of the y-axis with respect to the x-axis and the y-intercept is the (0,b) where the line intersects the y-axis at

x = 0.

We know the slope is (y₂ - y₁)/(x₂ - x₁).

∴ Here the temperature is y and the height is x.

And the points are (6000, 76) and (12000, 49)

So, slope =(12000 - 6000)/(49 - 76).

Slope = (6000/-27).

Slope = -(2000/9).

Now we have to determine the y-intercept by putting any of the points in y = mx + b.

So, 76 = -(2000/9)×6000 + b.

76 = -(12000/9) + b.

76 = -(4000/3) + b.

b = 4000/3 + 76.

b = 4228/3.

∴ y = -(2000/3)x + (4228/3) or T = -(2000/3)x + (4228/3).

26. The equation of line passing through the points (x₁ , y₁) and (x₂, y₂) with slope m is defined as;

⇒ y - y₁ = m (x - x₁)

Where, m = (y₂ - y₁) / (x₂ - x₁)

Given that;

he friends sold 15 cakes on the first day and 22 cakes on the second day of the bake sale.

On first day, they collect = $60

On second day, they collect = $88

Now,

We have to find the equation as;

⇒ R = mc + b

We need to find the value of m and b.

Since, The first point = (15, 60)

The second point = (22, 88)

Hence, Slope (m) = (88 - 60) / (22 - 15)

m = 28 / 7

m = 4

And, To find b substitute R = 60 , c = 15 and m = 4 in above equation,

⇒ R = mc + b

⇒ 60 = 4 x 15 + b

⇒ b = 0

Thus, Substitute m = 4 and b = 0 in equation (i) we get;

⇒ R = mc + b

⇒ R = 4c + 0

⇒ R = 4c

Therefore, The equation to represent the amount 'R' Natalia and her friends raised after selling 'c' cakes will be;

⇒ R = 4c

Hence we get the required answers.

Learn more about Linear relationship here:

brainly.com/question/13763238

#SPJ1

According to the distance-speed-time formula, the equation that could be used to solve this formula is 60/x+10 - 60/x = 1/2

Distance-speed-time

Basically, the formula for speed is speed = distance ÷ time.

In order to work out what the units are for speed, you need to know the units for distance and time.

Given,

Jackie travels 60 km to work. Since she began taking a new route (still 60 km to work) she gets there 30 minutes sooner because she can drive 10 km/hour faster.

Here we need to find the equations could you use to solve the problem.

Let us consider x be the speed of Jackie.

Therefore, the time has been calculated as,

Time1 = 60/ x

Now, the speed is increased as 10, then it can be written as,

=> x + 10

Therefore, the new time Time2 is calculated as,

=> Time2 = 60 / x + 10

So, the equation is obtained by calculating the difference of the times,

So, the equation is,

=> Time 2 - Time1

=> 60/x+10 - 60/x

Now, we know in this one she gets there 30 minutes sooner,

So, it can be written as,

=> 60/x+10 - 60/x = 30/60

=> 60/x+10 - 60/x = 1/2

To know more about Distance-speed-time here.

https://brainly.com/question/26862717

#SPJ1

The coefficient would be 3.6

The smallest positive integer that the intermediate value theorem guarantees a zero exists between 0 and a is 3.

What is the intermediate value theorem?

Intermediate value theorem is theorem about all possible y-value in between two known y-value.

x-intercepts

-x^2 + x + 2 = 0

x^2 - x - 2 = 0

(x + 1)(x - 2) = 0

x = -1, x = 2

y intercepts

f(0) = -x^2 + x + 2

f(0) = -0^2 + 0 + 2

f(0) = 2

(Graph attached)

From the graph we know the smallest positive integer value that the intermediate value theorem guarantees a zero exists between 0 and a is 3

For proof, the zero exists when x = 2 and f(3) = -4 < 0 and f(0) = 2 > 0.

Your question is not complete, but most probably your full questions was

Given the polynomial f(x)=− x 2 +x+2 , what is the smallest positive integer a such that the Intermediate Value Theorem guarantees a zero exists between 0 and a ?

Thus, the smallest positive integer that the intermediate value theorem guarantees a zero exists between 0 and a is 3.

Learn more about intermediate value theorem here:

brainly.com/question/28048895

#SPJ4

The total Cost of the equipment is $2,27,700. In which the following included, excluded and expensed as incurred are

Invoicing costs - included in the price

Electrical work required for installation - Included in the price

Delivery costs - included in the price

Sales tax - included in the price

Repair costs - not included or excluded

A machine used by a company to produce products and services is known as a machine tool. It is a vital long-term asset as it speeds up the production process such as transportation, computers and other equipment. These costs will include the costs that were necessary to start opening the plant property. There are equipment costs.

We have given the following details ,

Total Cost DR Machinary DR Expense

Invoice cost $190,000 $190,000

electric work

and $20,000 $20,000

installation cost

delivery cost। $4,000 $4,000

sales tax $13,700 $13,700

repair cost $1,850 $1,850

total $22,9550 $22,7700 $ 1,850

Accordingly, all the mentioned costs except for the repair of the part will be included in the cost of the machinery.

Included in price Excluded

invoice repair cost

electric and installation

delivery

sales tax

Hence , the total equipment cost is $22,7700.

To learn more about Equipment cost, refer:

https://brainly.com/question/15549536

#SPJ4

Answer:

it needs to be written step by step

Error = (10-9)°C & Error percentage = 10%.

Given that temperature today in Chicago is 50°F

Standard conversion formula

°C = [tex]\frac{5}{9} *(T^{0}F-32)[/tex]   - 1

Given T = 50°F

Put the value in equation 1

[tex]^{0}C = \frac{5}{9} *(50-32) \\\\= \frac{5}{9}*18\\ \\= \frac{90}{9}[/tex]

= 10°C

Tommasa's grandmothers rule is to subtract 32 from the value in °F and multiply the result by 0.5

i.e. [tex]^{0}C = 0.5(T^{0} F-32)[/tex]   - 2

Given temperature is T = 50°F

Put the value of T in equation 2

[tex]^{0}C = 0.5*(50-32)[/tex]

= 0.5 * 18

= 1/2 * 18

= 9°C

Temperature obtained by standard conversion Formula is 10°C and the temperature obtained by Tammaso's grandmother rule is 9°C.

So error = (10-9)°C

= 1°C

Error percentage = [tex]\frac{1}{10}*100[/tex]

= 10%

Hence the answer is Error = (10-9)°C & Error percentage = 10%.

To learn more about temperature conversion click here https://brainly.com/question/26141817

#SPJ9

By applying the exterior angle property, the measure of the exterior angle to ∠G in triangle EFG is 120.7°

In Mathematics, the exterior angle property can be defined as a theorem which states that the measure of an exterior angle in a triangle is equal in magnitude to the sum of the measures of the two remote or opposite interior angles of that triangle.

To determine the value of ∠G in triangle EFG (ΔEFG), we would have to apply exterior angle property.

Then, the exterior angle property can be used to model triangle EFG (ΔEFG)  is given by:

∠G = m∠E +m∠F

Now Substituting the given parameters into the formula, we have

∠G = 84.3° + 36.4°.

∠G = 120.7°.

Read more on exterior angle property here: brainly.com/question/29064528

#SPJ2

Regarding the objective function C = 3x + 4y, the minimum and the maximum value are given as follows:

The objective function is defined as follows:

C = 3x + 4y.

The extremas of the function, that is, the minimum and the maximum values, can be obtained at either of these following points:

These extreme values are the numeric values at these points.

In this problem, there is only a single curve, hence the vertices are given as follows:

(0,0), (0,4) and (4,0).

Then the numeric values of the objective function are these points are given as follows:

More can be learned about maximizing functions at https://brainly.com/question/28788613

#SPJ1

Answer:

Step-by-step explanation:

3 because at the bottem it is 3 away and top three away.

The missing number so that the equation has no solution is -3 5/6.

A linear equation is an equation that has a single variable that is raised to the power of one. When shown on a graph, a linear equation is a straight line that slopes either upwards or downwards.

If the equation has no solution, it means that the value of the left hand equation and the value of the right hand equation are equal.

In order to determine the solution, take the following steps:

x + 19 = 2x - 4 - 7x

Combine similar terms together: 19 + 4 = 2x - 7x - x

Add similar terms together: 23 = -6x

Divide both sides of the equation by -6: x = 23 / - 6

x = -3 5/6

To learn more about solutions, please check: https://brainly.com/question/25924997

#SPJ1

Answer:Total time minute Casey can talk= 689 Minute

Step-by-step explanation:Total charges of flat rate per month= $3. 99

Total Additional charge per minute = $0.05

Total monthly bill = $38. 44

Total additional charge=Total monthly bill - Total charge of flat rate

=$38.44-$3.99

=$34.45

Total time minute Casey cann talk=Total additional charge÷Total additional charge per minute

=$34.45÷$0.05

=689 Minute

For more about Time visit: https://brainly.com/question/15356513?referrer=searchResults

689 minutes long If Casey's monthly bill was $38.44, she would talk on her cell phone.

Given;

A cell phone provider charges a set monthly fee of $3. 99 plus an extra $0.05 per minute.

If Casey's monthly phone bill was $38.44, how many minutes did she use? 

The total charges of the flat rate per month = $3.99

The total additional charge per minute = $0.05

Total monthly bill = $38.44

Total additional charge = Total monthly bill - Total charge of flat rate

                                       = $38.44 - $3.99

                                       = $34.45

Total time per minute Casey can talk = Total additional charge/Total additional charge per minute

                                                       = $34.45 / $0.05

                                                       = 689 Minutes

Therefore, for 689 minutes Casey talk on her cell phone if her monthly bill was $38.44

To learn more about minutes click here:

brainly.com/question/15600126

#SPJ4

The largest integer value of x in the solution of the following inequality is 7/4.

We have given equation is 4x+6 ≥13

In the question we have to determine the largest integer value of a in the solution of the following inequality.

So first we have to solve this inequality equation:

4x+6 ≥13

4x≥13-6

4x≥7

x≥7/4

So the largest value of x is 7/4

Hence, the largest integer value of a in the solution of the following inequality is 7/4.

To learn more about largest integer value link is here

brainly.com/question/19348250

#SPJ1

The right answer is

Determine the largest integer value of x in the solution of the following inequality.

4x+6≥13

Answer:

11-k

Step-by-step explanation:

if you are asking what is as a equation its 11-7 because decreased means minus

The required mathematical expression for the given statement is 11-k.

A mathematical statement containing variables, numbers and related by at least one mathematical operator is considered as an expression.

Given that, a statement, what's eleven decreased by k,

Converting it into a mathematical expression,

Here, a value k is being extracted or subtracted by 11, that mean, the expression should be like k is being subtracted by 11.

That is = 11-k

Hence, the required mathematical expression for the given statement is 11-k.

Learn more about expression, click;

https://brainly.com/question/14083225

#SPJ2

The value of sin θ of the given right angle triangle using trigonometric ratios is; A: 5/13

The six trigonometric ratios are sine (sin), cosine (cos), tangent (tan), cotangent (cot), cosecant (cosec), and secant (sec). They are based on the angles formed from the ratio of sides of a right angle triangle. Thus;

sin θ = opposite/hypotenuse

cos θ = adjacent/hypotenuse

tan θ = opposite/adjacent

cosec θ = 1/sin θ

sec θ = 1/cos θ

cot θ = 1/tan θ

From the given image, we see that;

Hypotenuse = 13

Adjacent = 12

Opposite = 5

Thus;

tan θ = 5/12

θ = tan⁻¹(5/12)

sin θ = 5/13

Read more about Trigonometric ratios at; https://brainly.com/question/13276558

#SPJ1