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ser-zykov [4K]
4 years ago
12

The essential difference between an experiment and an observational study is that:

Mathematics
1 answer:
Mars2501 [29]4 years ago
8 0

Answer: e. An experiment imposes treatments on the subjects, but an observational study does not.

Step-by-step explanation:

Experiment is scientific procedure that is undertaken by an individual or a researcher in order for the person to either make a discovery, or test a hypothesis.

Observational studies are the studies whereby the researchers just observe the impact of a treatment or risk factor e.g. cohort studies. In observational study, the researchers just collect data based on what they've either heard or seen and they've no control over such variables collected whole for an experiment, treatments are applied to a group and the effects are recorded.

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A ball is launched from 8 feet off the ground at an initial vertical speed of 64 feet per second. It is aimed across a field at
victus00 [196]
<span>h = –16t 2 + 64t + 8
 since both the launch height and target height are identical we can say height is 0
 solve for t

0 = -16t^2 + 64t +8

-8(2t^2-8t-1) =0
divide both sides by -8

2t^2-8t -1 = 0

t = 4.12 and -0.121

 since it can't be a negative number:

t = 4.12 seconds  ( round off as needed)

</span>
6 0
3 years ago
Carl is standing at the top of 35 Ft cliff looking down at a rock for motion in the sea. He estimates the angle of depression is
Liula [17]

The horizontal distance between Carl and the rock at sea is approximately 60.62ft.

Data;

  • Angle = 30 degree
  • Opposite = 35
  • Adjacent = x

<h3>Trigonometric Ratio</h3>

Given the angle of depression from his point to the sea, we can use trigonometric ratio to calculate for the horizontal distance from his location to the bottom of the sea.

SOHCAHTOA

Since we have the value of angle and opposite and we need to calculate the adjacent side of the right-angle triangle, we can use the tangent of the angle to this effect.

Tan\theta = \frac{opposite}{adjacent} \\tan 30 = \frac{35}{x}\\ x = \frac{35}{tan30}\\ x = 60.62ft

The horizontal distance between Carl and the rock at sea is approximately 60.62ft.

Learn more on trigonometric ratio here;

brainly.com/question/12172664

7 0
2 years ago
Z^4 / z (when z = 1)
Alex

Answer:

1

Step-by-step explanation:

1^4= 1

1/1= 1

8 0
3 years ago
What is the area of a semicircle whose perimeter is 72cm
Nuetrik [128]

Answer:

A = 307.9 sq/cm

Step-by-step explanation:

Find the radius of the semi-circle

diameter + half the circumference = 72 cm

2r + pi*r = 72

r(2+pi) = 72

 

r = 72%2F%28%282%2Bpi%29%29

r = 14

:

what will be the area of that semicircle?

A =1%2F2*pi%2A14%5E2

A = 307.9 sq/cm

7 0
4 years ago
Determine the intercepts of the line.<br> y - 4= 7(x – 6)<br> x-intercept:<br> y-intercept:
cluponka [151]
X-intercept: (38/7,0)
Y-intercept; (0,-38)
8 0
4 years ago
Read 2 more answers
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