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frosja888
12 days ago
14

The proportion of students at a college who have GPA higher than 3.5 is 19%. a. You take repeated random samples of size 25 from

that college and find the proportion of student who have GPA higher than 3.5 for each sample. What is the mean and the standard error of the sampling distribution of the sample proportions?
Mathematics
1 answer:
Svet_ta [12.2K]12 days ago
8 0
Step-by-step explanation: The mean and standard error of the sampling distribution of the sample proportions is given by - where p represents the population proportion and n is the sample size. Given: The percentage of students at a college with a GPA exceeding 3.5 is 19%. Thus, p = 19% = 0.19. For a sample size of n = 25, the mean and standard error of that sampling distribution will be: Hence, the mean and standard error of the sampling distribution of sample proportions.
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At a large university, data were collected on the number of sisters and brothers that each student had. Let the random variable
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2.07. The mean for X is calculated as 1.00, and for Y as 1.07, leading to the total of X + Y = 1 + 1.07 = 2.07.
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A train station has installed a system for determining whether bags contain explosives. It has a 95% chance of correctly identif
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a) P(identified as explosive) equals P(actual explosive & identified as explosive) + P(not explosive & identified as explosive) = (10/(4*10^6))*0.95+(1-10/(4*10^6))*0.005 = 0.005002363. Thus, the probability that it actually contains explosives given that it's identified as containing explosives is (10/(4*10^6))*0.95/0.005002363 = 0.000475. b) Let the probability of correctly identifying a bag without explosives be a. Therefore, a = 0.99999763, approximately 99.999763%. c) No, even if this becomes 1, the true proportion of explosives will always be below half of the total detected.
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22 days ago
On a coordinate plane, solid circles appear at the following points: (negative 4, 2), (negative 2, 2), (negative 1, 4), (1, 1),
lawyer [12081]

Answer:

(1, 3)

Step-by-step explanation:

Provided:

A circle containing these specified points-

(4, 2), (-2, 2), (-1, 4), (1, 1), (1, 3), (2, -3).

A function resembles a mechanism that produces an output for each unique input. Each input must yield a distinct output.

The function's input is characterized as the domain, and the output corresponds to its range.

The domain is indicated by the 'x' coordinate while the range is represented by the 'y' coordinate.

This means the domain serves as the independent variable, and the range is contingent upon the domain’s values.

In this case, a relation or set of points constitutes a function only if every 'x' in the ordered pairs is unique.

Within the described relation, the pairs (1, 1) and (1, 3) share the same input. Thus, removing either one will convert the relation into a function.

Therefore, choosing (1, 3) is the right answer.

5 0
1 month ago
Read 2 more answers
What is the solution to the system of equations? y = A system of equations. Y equals StartFraction one-third EndFraction minus 1
lawyer [12081]

Response:

(6,-8).

Detailed explanation:

We have a set of equations provided. Our task is to find the solution for this system.

y=\frac{1}{3}x-10...(1)

2x+y=4...(2)

Starting from equation (2), we will derive:

y=4-2x...(2)

Next, by inserting this value into equation (1), we will achieve:

4-2x=\frac{1}{3}x-10

After multiplying both sides by 3, we will arrive at:

3\cdot 4-3\cdot 2x=3\cdot \frac{1}{3}x-3\cdot 10

12-6x=x-30

12-6x-x=x-x-30

12-7x=-30

12-12-7x=-30-12

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Now substituting this back into equation (2), we will find:

y=4-2(6)

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Thus, the solution to our specified set of equations is (6,-8).

4 0
15 days ago
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Suma numerelor de forma a4b cu produsul cifrelor 24 este egala cu
AnnZ [11867]

Answer:

The correct response is: b)

Step-by-step explanation:

a4b=24, where a × 4 × b = 24 implies a × b = 6

The pairs of numbers with a product of 6 include: {1,6} and {2,3}

In base 10, a4b translates to 100a + 40 + b

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100×3+40+2=342

Summing these results yields: 146 + 641 + 243 + 342 = 1372

The correct answer is: b)

6 0
1 month ago
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