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Stella [2.4K]
2 years ago
10

A study of video game usage and eyesight was looked at 400 high school students. For each student who plays games, the investiga

tor found someone of the same in various aspects (same sex, age, and race, etc.) who does not play games. And he measured their eyesight to compare. What type of experimental design is this?
a. Matched pairs design. b. Randomized Block design
C. A completely randomized design
d. An Uncontrolled experiment e. Convenience design
Mathematics
1 answer:
Svetllana [295]2 years ago
5 0

Answer:

Explanation is in a file

Step-by-step explanation:

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I think it is b
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Wei has $150.00 to make a garland using 60-cent balloons. He wants to purchase 100 blue balloons and some number of white balloo
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Answer:

He can purchase 300 white baloons.

Step-by-step explanation:

150$ is 15000 cents

15000 = 60b + 30w

b being number of blue baloons,w number of white baloons and 60 and 30 prices in cents

15000 = 60*100 + 30w

15000 - 60*100 = 30w

15000- 6000 = 30w

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number of white baloons is 300

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1/8 = 4 so then just multiply by 8 to get 32
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If sin θ = 1/2 , then find the value of (sin 3 θ)/(1+ cos 2 θ)<br>​
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<u>EXPLANATION</u><u>:</u>

Given that

sin θ = 1/2

We know that

sin 3θ = 3 sin θ - 4 sin³ θ

⇛sin 3θ = 3(1/2)-4(1/2)³

⇛sin 3θ = (3/2)-4(1/8)

⇛sin 3θ = (3/2)-(4/8)

⇛sin 3θ = (3/2)-(1/2)

⇛sin 3θ = (3-1)/2

⇛sin 3θ = 2/2

⇛sin 3θ = 1

and

cos 2θ = cos² θ - sin² θ

⇛cos 2θ = 1 - sin² θ - sin² θ

⇛cos 2θ = 1 - 2 sin² θ

Now,

cos 2θ = 1-2(1/2)²

⇛cos 2θ = 1-2(1/4)

⇛cos 2θ = 1-(2/4)

⇛cos 2θ = 1-(1/2)

⇛cos 2θ = (2-1)/2

⇛cos 2θ = 1/2

Now,

The value of sin 3θ /(1+cos 2θ

⇛1/{1+(1/2)}

⇛1/{(2+1)/2}

⇛1/(3/2)

⇛1×(2/3)

⇛(1×2)/3

⇛2/3

<u>Answer</u> : Hence, the req value of sin 3θ /(1+cos 2θ) is 2/3.

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The diffrence between two positive numbers is 7 and the square of thier sum is 289​
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Answer:

One of the Numbers is -151 and the other is -144

Step-by-step explanation:

Set up the equations then solve

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