An educational researcher requires a sample of high school administrators. She does not have a list of all high school administrators, but she does have a list of high schools, so she randomly chooses five high schools from her list and includes all administrators from the chosen schools in her sample. What sampling technique did the researcher use

Answer:

the answer to part is 112.5 and part b is 4612.5 dont completely trust me though

Answer:

His estimate is reasonable

Step-by-step explanation:

1/10 + 6/10 = 7/10, which can be rounded to 1

1/10, 2/10, 3/10, 4/10, 5/10, 6/10, 7/10, 8/10, 9/10, 1

As you can see, 7/10 is very close to 1.

Hope this helps!

Answer:

55

Step-by-step explanation:

11 x 5 = total combinations

11 x 5 = 55

According to the question, the four consecutive numbers can be written as :

First = \(x\); Second = \(x+2\);  Third = \(x+4\); Fourth = \(x+6\)

As per the question, the final expression is :

\(2((x+2)+(x+4)) = 3(x)+32\)

\(4x+12 = 3x+32\)

\(x = 20\)

Therefore, the four values can be calculated by substituting the above value:

\(x=20; x+2=22; x+4=24; x+6=26\)

The four consecutive numbers are: \(20,22,24,26\)

Substitute the calculated values in the final expression, to check whether the answer is correct or not.

\(2(22+24) = 3(20)+32\)

\(92=92\)

Therefore, the calculated values are correct.

What are consecutive terms?

Consecutive terms are those terms which follow one sequential order.

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A value x with a z-score of 3.4 is an example of an outlier. An outlier is a data point that lies outside the overall pattern in a distribution.

A value that differs significantly from the other values in a data set is referred to as an outlier. In other words, outliers are values that deviate unusually from the mean.

Most of the time, outliers affect the mean but not the median or mode. As a result, the outliers' impact on the mean is crucial.

To find the outliers, there is no rule. However, if a value exceeds 1.5 times the value of the interquartile range outside of the quartiles, some books refer to it as an outlier.

In order to find the outliers, the data can also be plotted as a dot plot on a number line.

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Answer:

SRQ=24°

QTS=30°

RST=60°

RSQ=30°

Step-by-step explanation:

All angles in a triangle will always=180.

First we will find RQT

30+24+Q=180

Subtract 54 from each side

Q=126

Since All lines meet in the middle at Q, then each if those angle measures are equal.

We'll find SRQ first:

We don't know S but we know R is 24 and Q is 126

126+24+S=180

subtract 150

S=30°

QTS:

It tells us that T is 70° so that's all we need for this

RST:

We found half of S which was 30, so 30•2= 60 so RST=60

RSQ:

We already found the half of S which was 30°

Hope this helps! If you have any questions on how I got my answer feel free to ask. Stay safe!

The present ages are the Boy is 17 years old and his sister's age is 14 years old.

Since the ratio of ages is 4: 3 take them as 4x and 3x and form an equation as given in the problem. Solve the resultant equation for the values of 'x'. And calculate the ages 5 years ago and add 5 to get the present ages.

Here we have

A boy is older than his sister by 3 years  

Then the difference is both ages = 3

Given that five years ago the ratio of ages = 4: 3  

Let 4x and 3x be the age of a boy and his sister five years

As we know the difference between them = 3 years

=> 4x - 3x = 3

=> x = 3 years

=> 4x = 4(3) = 12

Boy's age after '5' years = 12 + 5 = 17 years

His sister's age = 17 - 3 = 14 years

Therefore,

The present ages the Boy is 17 years old and his sister's age is 14 years old.

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Complete Question:

A boy is older than his sister by 3 years, five years ago the ratio was 4:3. Find his present age.

Answer:

Horizontal translation of 4 units left

Step-by-step explanation:

Adding a number to the variable moves the graph horizontally to the left.

Answer:

your answer is 16.5

Step-by-step explanation:

First, turn 15% into a decimal; which is .15

Second, multiply .15 by 110 and you get 16.5

soooo your answer is 16.5

(use symbolab I use it all the time)

Answer:

Q = P - n(x/100)

Step-by-step explanation:

P is the total number of lace edging, n is the number of times the length x is cut from P, and Q is the remnant of the reduction.

So the number of x length is subtracted from P and must be converted to meters (since it is in centimeters) to get Q. That is;

Q = P - n(x/100)

Answer:

The probabilities of the individual outcomes are the same.

The probability model for this situation is uniform.

Step-by-step explanation:

There is 2 of each number so there is an equal chance. when there is an equal chance that is uniform.

Answer:

i hope this helped :)

Step-by-step explanation:

In the event of describing the likelihood that the team rebounds the next missed shot is likely, and the number of rebounds that the team should expect to have missed in 15  shots is 10.5 rebounds.

Given

Number of shots missed by the given team is 7

Total number of shots fired is 10

a) Then, moving on to the first part of the question

Here we have to apply probability to evaluate the likelihood of the given team rebounds the next missed shot.

Then,

Probability = no of shots attended / total number of shots fired

Probability = 7 /10

Then the event is likely

b) Now the second part

Then the number of rebounds the given team expect to have in the next 15 missed shots

= 7/10 ×15

= 105/10

= 10.5 rebounds

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Answer:

75%

Step-by-step explanation:

9/12 =

9 ÷ 12 =

0.75

Which is 0.75= .75

so 75/100= 75%

ZaZa Out-

The power series representation for ln((1+x)/(1-x)) is given by: ln\(((1+x)/(1-x)) = 2(x + (x^3)/3 + (x^5)/5 + (x^7)/7 + ...)\), This representation is valid for |x| < 1, as it is derived using the power series expansion of ln(1+x) and ln(1-x), which have a convergence radius of 1.

To find the power series representation of ln((1+x)/(1-x)), we'll use the properties of the natural logarithm function and the geometric series.

First, we'll rewrite the expression using the properties of logarithms:

ln((1+x)/(1-x)) = ln(1+x) - ln(1-x)

Now, let's find the power series representation for ln(1+x) and ln(1-x) separately.

Power series representation of ln(1+x):

We know that the power series representation of ln(1+x) is given by: \(ln(1+x) = x - (x^2)/2 + (x^3)/3 - (x^4)/4 + ...\)

Power series representation of ln(1-x):

Similarly, the power series representation of ln(1-x) is given by:

\(ln(1-x) = -x - (x^2)/2 - (x^3)/3 - (x^4)/4 - ...\)

Now, we'll subtract the series representation of ln(1-x) from ln\((1+x): ln((1+x)/(1-x)) = (x - (x^2)/2 + (x^3)/3 - (x^4)/4 + ...) - (-x - (x^2)/2 - (x^3)/3 - (x^4)/4 - ...) = x - (x^2)/2 + (x^3)/3 - (x^4)/4 + ... + x + (x^2)/2 + (x^3)/3 + (x^4)/4 + ... = 2(x + (x^3)/3 + (x^5)/5 + (x^7)/7 + ...)\)

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Considering the perimeter concept, we have that:

The perimeter of a polygon is given by the sum of all the lengths of the outside edges of the polygon.

For this problem, the outside edges are given as follows:

Danielle's mistake is that she did not consider two outside edges, one of length 6x - 4 and the other of length 12x + 3. Considering all the edges, the perimeter is given by:

P = 2(6x - 4) + 2(12x + 3) + 14x + 13

P = 12x - 8 + 24x + 6 + 14x + 13

P = 12x + 24x + 14x + 8 + 6 + 13

P = 50x + 27.

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Answer:

(x+2)^2 - 6

Step-by-step explanation:

Answer:

The first table

Step-by-step explanation:

You have to make sure that x is unique throughout.

First Table: the inputs are 2, 4, 6, 7

each input value is different or unique

Second Table: input values are 3, 5, 3, 5

three and five repeat themselves, so there is not a function

Third Table: input values are -2, 0, 1, -2

negative 2 repeats itself so it is not unique

(a)i. Evaluating the constant:

\($$\int_{-1}^{1} c(1+x)(1-2x) dx = 1$$$$\implies c = \frac{3}{4}$$\)

Therefore, the probability density function is:

\($$f(x) = \frac{3}{4} (1+x)(1-2x), -1< x < 1$$\) ii. Plotting the probability density function:

From the graph, it is observed that the density function is skewed to the left.

(b)i. The mean:

\($$E(X) = \int_{-1}^{1} x f(x) dx$$$$E(X) = \int_{-1}^{1} x \frac{3}{4} (1+x)(1-2x) dx$$$$E(X) = 0$$\)

ii. The second moment about the origin:

\($$E(X^2) = \int_{-1}^{1} x^2 f(x) dx$$$$E(X^2) = \int_{-1}^{1} x^2 \frac{3}{4} (1+x)(1-2x) dx$$$$E(X^2) = \frac{1}{5}$$\)

Therefore, the variance is:

\($$\sigma^2 = E(X^2) - E(X)^2$$$$\implies \sigma^2 = \frac{1}{5}$$\)

iii. The standard deviation:

$$\sigma = \sqrt{\sigma^2} = \sqrt{\frac{1}{5}} = \frac{\sqrt{5}}{5}$$(c)

i. The cumulative distribution function:

\($$F(x) = \int_{-1}^{x} f(t) dt$$$$F(x) = \int_{-1}^{x} \frac{3}{4} (1+t)(1-2t) dt$$\)

ii. The probability density function can be obtained by differentiating the cumulative distribution function:

\($$f(x) = F'(x) = \frac{3}{4} (1+x)(1-2x)$$\)

iii. Evaluating\(P(-0.2 < X <0.2):$$P(-0.2 < X <0.2) = F(0.2) - F(-0.2)$$$$P(-0.2 < X <0.2) = \int_{-0.2}^{0.2} f(x) dx$$$$P(-0.2 < X <0.2) = \int_{-0.2}^{0.2} \frac{3}{4} (1+x)(1-2x) dx$$$$P(-0.2 < X <0.2) = 0.0576$$\)

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Answer:

The two numbers are 10 and 8.

Step-by-step explanation:

the difference (subtract) of two numbers is two (that means the equation is equal to two) and their product is 80 (multiplication equals 80)

Answer:

Median :

P = 2 ; Q = 3.5

Variability :

P = 1.5 ; Q = 1.5

Step-by-step explanation:

The measure of center we can infer from the box plot is the median, which is the point marked by the vertical line in between the box ;

For Group P:

Median = 2 inches

For Group Q :

Median = 3.5 inches

To infer the variability :

We calculate the interquartile range (IQR) :

IQR = Q3 - Q1

Q3 = Upper quartile (end point of box) ; Q1 = lower quartile (start point of box) in the plot

Locate QI and Q3

Group P:

IQR = Q3 - Q1 = 3 - 1.5 = 1.5

Group Q :

IQR = Q3 - Q1 = 4.5 - 3 = 1.5

Answer:

A

Step-by-step explanation:

This is considered as decision making under risk.

Decision Making Under Risk

A circumstance in which the implications of the chosen course of action and the likelihood that it will occur are understood is referred to as decision-making under risk . For instance, the lottery selection tasks are frequently employed to examine the nature of decision-making in risky situations.

We make the assumption that there are two or more choices and that each alternative's characteristics are explicitly specified. For each attribute, the CV (coefficient of variation) is configured in case of such decision under risks. And, since in the given question, decision maker is supposed to consider several possible outcomes for each alternative, each with a given probability of occurrence. Thus the decision made will be decision under risk.

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When making a joint probability table, the type of probabilities is contained in the cells except those cells on the margin of the table joint probabilities, while those on the margins are marginal probabilities.

A joint probability refers to the probability that two independent events will both occur. two or more random variables. It is a statistical measure that calculates the probability of two events occurring together and at the same point in time i.e., joint probability is the probability of event Y occurring at the same time that event X occurs. A joint probability table represents a joint probability distribution for two or more random variables illustrating the relationship between variables (it uses variables or conditions instead of events). In the joint probability table, the type of probabilities that are contained in the cells are joint probabilities, while those on the margins are marginal probabilities (probabilities of values of the variables in the subset without reference to the values of the other variables.).

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The unit price that is going to be needed for the 31 minute ride would be 21.4 dollars.

We have the fare for 81 minutes to be $56. 70

Then we are to find the amount that would be needed for 31 minutes.

In order to get this value we would have to cross multiply

such that we would have

81 minutes = $56.70

31 minutes = ?

then 56 * 31 = 1736

1736 / 81

= 21.4 dollars.

Hence we would conclude that the unit price that is going to be needed for the 31 minute ride would be 21.4 dollars.

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Answer:

A

Step-by-step explanation:

Hello there!

When we are given the graph of a line and two points on the graph, we can calculate the slope of the line using Rise/Run.

Rise=How many units we move up (here, the rise is 3)

Run=How many units we move left or right (Here, the run is 5)

So the slope of this line is \(\frac{3}{5}\)

Hope this helps you!

~Just a joyful teen

\(SilentNature(GraceRosalia)\)

Answer:

-4

Step-by-step explanation:

The currents i1, i2, and i3 are 10 A, 10 A, and 10 A, respectively. The currents i1, i2, and i3 can be found using the following equations:

i_1 = \frac{v_1}{r_1} = \frac{100}{1} = 10 A

i_2 = \frac{v_2}{r_2} = \frac{100}{1} = 10 A

i_3 = \frac{v_3}{r_3} = \frac{100}{1} = 10 A

where v1, v2, and v3 are the voltages across the resistors r1, r2, and r3, respectively.

The currents i1, i2, and i3 are all equal to 10 A because the resistors r1, r2, and r3 are all equal to 1 ohm. Therefore, the current will divide equally across the three resistors.

The currents i1, i2, and i3 are the currents flowing through the resistors r1, r2, and r3, respectively. The currents are found by dividing the voltage across the resistor by the resistance of the resistor.

The voltage across a resistor is equal to the product of the current flowing through the resistor and the resistance of the resistor. The resistance of a resistor is a measure of the opposition that the resistor offers to the flow of current.

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Answer:

Larger number: 21

Smaller number: 6

Step-by-step explanation:

Step 1: Make equations.

x ... larger number

y ... smaller number

First equation: The larger of two numbers is 15 more than the smaller number.

x = y + 15

Second equation: Sum of the two numbers is 27.

x + y = 27

Step 2: Solve the system of equations.

First equation: x = y + 15

Second equation: x + y = 27

Substitute x in second equation with x from first.

x + y = 27

(y + 15) + y = 27

Solve for y.

y + 15 + y = 27

2y = 27 - 15

2y = 12

y = 6

Substitute the calculated value of y back in first equation to get x.

x = y + 15

x = 6 + 15

x = 21