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3 years ago

In a correlational study, ____.

Mathematics

1 answer:

maksim [4K]3 years ago

4 0

Answer:

Option B, two variables are measured and two groups are compared

Step-by-step explanation:

In a correlation study relationship between two variable is established.

The two variables represents two group.

For instance correlation study is conducted to determine the relationship between two variables X and Y

X and Y are variable

While X represents the group "number of cars passing through a lane"

Y represents the group "width of the road".

Hence, Option B is correct

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If 840 CLASS eighth graders, making up 4/5 of total eighth, studied algebra during summer, how many eighth graders are enrolled

Anarel [89]

Answer:

1008

Step-by-step explanation:

If 4/5 of eighth graders, or 80%, are enrolled with class, there are still 20% of students that didn't study. That means you add 168, the 20%, and you'll get 1008.

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2 years ago

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skad [1K]

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Step-by-step explanation:

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3 years ago

Determine the amount you need to invest to have $22,000 dollars in 4 years if you invest at 5% annual interest, compounded quart

zvonat [6]

Answer:

Step-by-step explanation:

Метод

сложных процентов:

S = 100 (1+

0,10/2)^2*2 = 100*1,2155

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4 years ago

Given f(x)=3x+12, find f(f^-1(0))

mamaluj [8]

Answer:

Step-by-step explanation:

METHOD 1.

We know:

$f\bigg(f^{-1}(x)\bigg)=x$

Therefore

$f\bigg(f^{-1}(0)\bigg)=0$

METHOD 2.

$\text{Find}\ f^{-1}(x)$

$f(x)=3x+12\to y=3x+12$

exchange x to y and vice versa:

$x=3y+12$

solve for y:

$3y+12=x$ subtract 12 from both sides

$3y=x-12$ divide both sides by 3

$y=\dfrac{x-12}{3}\to f^{-1}(x)=\dfrac{x-12}{3}$

$f\bigg(f^{-1}(x)\bigg)\to$ replace x in f(x) with the expression $\dfrac{x-12}{3}$

$f\bigg(f^{-1}(x)\bigg)=3\cdot\dfrac{x-12}{3}+12=x-12+12=x$

$f\bigg(f^{-1}(0)\bigg)\to$ put x = 0 to $f\bigg(f^{-1}(x)\bigg)=x$

$f\bigg(f^{-1}(0)\bigg)=0$

METHOD 3.

$\text{Find}\ f^{-1}(x)$

$f^{-1}(x)=\dfrac{x-12}{3}$

Calculate the value of f ⁻¹(x) for x = 0:

$f^{-1}(0)=\dfrac{0-12}{3}=\dfrac{-12}{3}=-4$

Calculate the value of f(x) for x = -4:

$f(4)=3(-4)+12=-12+12=0$

6 0

4 years ago

a coach asked two players how much water they drank before practice. Ashley said she drank 1/2 pint and Claire said she drank 0.

Andre45 [30]

1. The problem gives the following information: Ashley said she drank 1/2 pints and Claire said she drank 0.7 pints.

2. Therefore, to solve this problem you must follow the proccedure that is shown below:

3. You must sum the amount of water that Ashley and Claire drank before the practice. Then, you have:

1/2 pints=0.5 pints (Ashley)
0.7 pints (Claire)

x=0.5 pints+0.7 pints
x=1.2 pints

How many pints of water did Ashley and Claire drink combined?

The answer is: 1.2 pints or 1 1/5 pints

8 0

3 years ago