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Oduvanchick [21]
3 years ago
6

A teacher interested in determining the effect of a new computer program on learning to read conducted a study. One hundred stud

ents were randomly assigned to one of two groups. The first group used the computer program while the second group did not. Both groups were tested to determine how much their reading levels improved. The results for the two groups were compared. What kind of study is this?
Mathematics
2 answers:
anzhelika [568]3 years ago
5 0
Due to that situation, I came to conclusion that is is case control study. It's a kind in wich students who have specific conditions are compared with students who don't have it. 
m_a_m_a [10]3 years ago
3 0

Answer:

an experiment because a treatment was applied to a group.

Step-by-step explanation:

I got this correct.

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Solve using law of sines or law of cosines!
malfutka [58]

Answer:

Part 5) The length of the ski lift is 1.15\ miles

Part 6) The height of the tree is 18.12 m

Step-by-step explanation:

Part 5)

Let

A -----> Beginning of the ski lift

B -----> Top of the mountain

C -----> Base of mountain

we have

b=0.75\ miles

A=20\°

C=180\°-50\°=130\° ----> by supplementary angles

Find the measure of angle B

Remember that the sum of the interior angles must be equal to 180 degrees

B=180\°-A-C

substitute

B=180\°-20\°-130\°=30\°

Applying the law of sines

\frac{b}{sin(B)}=\frac{c}{sin(C)}

substitute

\frac{0.75}{sin(30\°)}=\frac{c}{sin(130\°)}

c=\frac{0.75}{sin(30\°)}(sin(130\°))

c=1.15\ miles

Par 6)

see the attached figure with letters to better understand the problem

<u><em>Applying the law of sines in the right triangle BDC</em></u>

In the right  triangle BDC 20 degrees is the complement of 70 degrees

\frac{BC}{sin(70\°)}=\frac{x}{sin(20\°)}

BC=(sin(70\°))\frac{x}{sin(20\°)} -----> equation A

<u><em>Applying the law of sines in the right triangle ABC</em></u>

In the right  triangle ABC 50 degrees is the complement of 40 degrees

\frac{BC}{sin(40\°)}=\frac{x+15}{sin(50\°)}

BC=(sin(40\°))\frac{x+15}{sin(50\°)} -----> equation B

Equate equation A and equation B and solve for x

(sin(70\°))\frac{x}{sin(20\°)}=(sin(40\°))\frac{x+15}{sin(50\°)}\\\\2.7475x=0.8391(x+15)\\\\2.7475x=0.8391x+12.5865\\\\2.7475x-0.8391x=12.5865\\\\x=6.60\ m

<u><em>Find the value of BC</em></u>

BC=(sin(70\°))\frac{6.6}{sin(20\°)}

BC=18.12\ m

therefore

The height of the tree is 18.12 m

5 0
4 years ago
The equation y = 5.78 • 1.15x fits the graph of stock XYZ over the past month with an r-value of .9918. How much do you think XY
lilavasa [31]
Not sure if this is right or not, but I chose 125.11 after I typed in the equation, haven’t used R-value at all. Will comment if correct — APEX
8 0
3 years ago
Read 2 more answers
Find the measure of the three missing angles in the rhombus below.<br>Explain it.
wlad13 [49]

The measure of the three missing angles in the given rhombus are:

x = 122°

z = 58°

y = 122°

<h3>What is a Rhombus?</h3>

A rhombus is a quadrilateral with four interior angles. In a rhombus, the opposite angles are congruent while the adjacent angles are supplementary to each other.

x and 58° are adjacent angles and are therefore supplementary.

x = 180 - 58 = 122°

z = 58° (opposite angles)

y = x = 122° (opposite angles)

Learn more about a rhombus on:

brainly.com/question/20627264

#SPJ1

6 0
2 years ago
Pam kept track of the puppies available for adoption at the shelter. after 2 hours, there were 10 puppies available for adoption
Sav [38]
2d hour- 10 puppies
3rd hour- 8 puppies
4th hour- 6 puppies
5th hour- 4 puppies
6th hour- 2 puppies
6 0
4 years ago
A scale drawing of a bedroom is shown below. The scale is 1 : 30.
LenaWriter [7]
" = inches
' = feet

the scale is 1:30 
3" * 30" = 90"
4" * 30" = 120"

the room is 90" by 120"

90" / 12" = 7.5'
120" / 12" = 10'

the room is 7.5' by 10'

7.5' * 10' = 75' ^2
^ = exponential sign (10^2) means 10 to the second power.

The area of the room is 75' ^2
7 0
3 years ago
Read 2 more answers
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