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uranmaximum [27]
3 years ago
9

In one study on the effect of argan oil on wrinkles, 125 subjects who acknowledged being long-time argan oil users had their wri

nkles compared with those of 125 people who had never used argan oil. In a second study, 75 subjects were chosen randomly to use argan oil and 75 were chosen to use a placebo. Identify the types of studies performed. (4 points)
Mathematics
1 answer:
brilliants [131]3 years ago
6 0

Answer:   The first study was an observational study whereas the second was a controlled experiment.

Step-by-step explanation:

A study that record the characteristics of a population by studying individuals in a sample, but does not manipulate variables of interest is known as an operational study. Like in the first study only effects have been noted.

A controlled experiment is an experiment where the variable of interest is directly manipulated by a scientist, in order to test a single variable at a time.

Like in the second study, the subjects were under the control of the experimenter, to test the effect of oil.

The first study was an observational study whereas the second was a controlled experiment.

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Y – 1 = 2(x – 2), solve for y
solmaris [256]

Answer:

y = 2x-3

Step-by-step explanation:

y – 1 = 2(x – 2)

Distribute

y-1 =2x-4

Add 1 to each side

y-1+1 = 2x-4+1

y = 2x-3

6 0
2 years ago
To copy an angle using only a compass and a straightedge, begin by marking the vertex of the new angle. Then draw a ray from the
podryga [215]

The <em>correct answer</em> is:


Place the point of the compass on the vertex of our original angle. Open the compass to a random width and draw an arc through both legs of the angle. Mark the points of intersection with this arc and the sides of the angle.


Explanation:


In order to copy the angle, we need to have some reference for how wide the angle is.


So far all we have is a ray. To get the reference for the width that we need, we will construct an arc in the original angle such that it intersects each side of the angle.


We will then set the compass width to these points of intersection. This will be how we set the width of the new angle.

5 0
3 years ago
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Marci, Bobby, and Max began their homework at the same time. Marci finished her homework in 60 minutes. Bobby finished his homew
NeX [460]

Answer: Marci: 60 minutes

Bobby: 30 minutes

Max: 90 minutes

Step-by-step explanation:

50% of 60 is 30.

100% of 60 is 60, plus 50% is 60+30, which gets you 90.

5 0
2 years ago
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Which Factors would simplify in this expression?
kolbaska11 [484]

Answer:

(x+6)

Step-by-step explanation:

because you have ( x+6) on bottom of the first equation and on the top on the second equation

7 0
2 years ago
Which of the expressions below are equal to 5x + 20y? Select all that apply.
xeze [42]
The correct answers are A and B.
Hope this helps!
8 0
2 years ago
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