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Nikolay [14]
3 years ago
9

Determine whether the samples are independent or dependent. Upper A data set includes the weight of 140 students before and afte

r their first year of college. Choose the correct answer below. A. The samples are independent because there is a natural pairing between the two samples.B. The samples are dependent because there is not a natural pairing between the two samples.C. The samples are dependent because there is a natural pairing between the two samples.D. The samples are independent because there is not a natural pairing between the two samples
Mathematics
1 answer:
Serhud [2]3 years ago
7 0

Answer:

Option C)

Step-by-step explanation:

The samples are dependant.  There should be a relation between the weights of the students, even though there could be changes, as any value can go up or down. A student with a weight around of 30 has a higher chance of getting a weight around of 35 after the firts year than a student with weight around of 55. This means that the probability a student has for getting certain amount of weight after the first year may change depending on the weight the student had at the start of the year. You can therefore naturally relate the weight a student had before the first year with the weight the student had after the first year.

So, the samples are dependant because there is a natural pairing between the to samples, as option C says.

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B. The school prom committee sold presale tickets for
Ivan

Answer:

218 students purchased tickets at the dance.

Step-by-step explanation:

Let,

x be the number of presale tickets

y be the number of tickets sold at the dance

According to given statement;

x+y=334      Eqn 1

18x+24y=7320    Eqn 2

Multiplying Eqn 1 by 18

18(x+y=334)

18x+18y=6012      Eqn 3

Subtracting Eqn 3 from Eqn 2

(18x+24y)-(18x+18y)=7320-6012

18x+24y-18x-18y=1308

6y=1308

\frac{6y}{6}=\frac{1308}{6}\\y=218

Therefore,

218 students purchased tickets at the dance.

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2 years ago
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Answer:

A. 9

B. 7

Step-by-step explanation:

7 0
2 years ago
What is the solution to the following equation? x2 + 3x + 4 = 0​
andreev551 [17]

Answer:

x=\dfrac{-3\pm \sqrt7i}{2}

Step-by-step explanation:

The given equation is x^{2}+3x+4=0.

We need to find the solution of the above equation.

The solution of an equation ax^2+bx+c=0 is :

x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}

We have, a = 1, b = 3 and c = 4

x=\dfrac{-3+ \sqrt{(3)^2-4(1)(4)} }{2}, \dfrac{-3- \sqrt{(3)^2-4(1)(4)} }{2}\\\\=\dfrac{-3+\sqrt{9-16}}{2}, \dfrac{-3-\sqrt{9-16}}{2}\\\\=\dfrac{-3\pm \sqrt7i}{2}

So, the solution of the given equation is \dfrac{-3\pm \sqrt7i}{2}.

5 0
3 years ago
What is the length of the segment connecting the points (-9,3) and (-9,-2)?
kramer

Answer:

5

Step-by-step explanation:

same x coordinate

length = 3 + 2 = 5

3 0
3 years ago
Find the unknown<br> G/20=0.65<br><br> 0.7=7/W<br><br> N/50=0.18
iren [92.7K]
I figured out that <span>0.7=7/W means that W=10.

</span>
3 0
2 years ago
Read 2 more answers
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