A researcher is comparing the effectiveness of three devices designed to help people who snore. There are 120 people who snore participating in the experiment. Using a table of random digits, the researcher will randomly place the participants into three equally sized treatment groups suitable for comparison.

Which design is the most appropriate for this experiment?

A Randomly number each person with 1, 2, or 3. Assign the people labeled 1 to the device 1 group, the people labeled 2 to the device 2 group, and the people labeled 3 to the device 3 group.
B Number each participant from 1 to 120. Reading numbers from left to right from a random number table, identify 80 unique numbers from 1 to 120. Assign the people whose labels are the first 40 numbers to the device 1 group. Assign the people whose labels are the second 40 numbers to the device 2 group. Assign the remaining people to the device 3 group.
C Number each participant from 000 to 119. Reading numbers from left to right on a random number table and looking at three digits at a time, identify 80 unique three-digit numbers from 000 to 119. Assign the people whose labels are the first 40 numbers to the device 1 group. Assign the people whose labels are the second 40 numbers to the device 2 group. Assign the remaining people to the device 3 group.
D Select a participant, and identify the first digit reading numbers from left to right on a random number table. If the first digit is a 1, 2, or 3, assign the participant to the device 1 group. If the first digit is a 4, 5, or 6, assign the participant to the device 2 group. If the first digit is a 7, 8, or 9, assign the participant to the device 3 group. If the first digit is a 0, skip that digit and move to the next one to assign the participant to a group. Repeat this process for each participant.

Answers

Answer 1

Answer:

A

Step-by-step explanation:

A is the less complicated one and the simplest but also the most efficient and the one that makes the most sense.

Answer 2

Answer:

C

Step-by-step explanation:

edge 2021


Related Questions

A farmer sells 9.2 kilograms of apples and pears at the farmers market 4/5 of this weight is apples and the rest is pears. How many kilograms of pears did she sell at the farmers market

Answers

9.2 kg of apples and pears combined
4/5 of 9.2 kg are apples
4/5=0.8=80%
100% 9.2 kg
80%. X kg
X= 80 • 9.2/100
X=736/100
X=7.36 kg of apples


9.2kg-7.36kg=1.84 kg of pears

11=w+3–solving equations

Answers

Answer:

w = 8

Step-by-step explanation:

11 = w + 3

11 -3 = 8

Answer:

w=8

Step-by-step explanation:

Help? I may have asked this question already ​

Answers

Answer:

yes

Step-by-step explanation:

Help please
I’m trying to find value of x and y. i need to write out the problem

Answers

The answer is x=4.5 and y=1 they are dilated by multiplying 3

I need help asap!! will give crown

Answers

Answer:

A. Rectangle

Step-by-step explanation:

Shown in the attachment are the four points graphed on a coordinate plane.

We can see that the opposite sides are parallel to each other and have the same length.

The answer cannot be B. Square because the side lengths of this quadrilateral are not all equal to each other.

The answer cannot be C. Rhombus because of the same reason as above.

The answer cannot be D. Trapezoid because the bases of the quadrilateral are not of different lengths.

Therefore, the answer must be A. Rectangle since the angles are 90° angles, and the opposite sides are parallel and equal.

I dont understand please help Which expression is equivalent to 8-(6r+2) A -6r+6 B 2r+2 C 6r+10 D -6r+10

Answers

Answer:

-6r+6

Step-by-step explanation:

Given data

We are given the expression

8-(6r+2)

let us expand it by opening the bracket

=8-6r-2

collect like terms

=8-2-6r

=6-6r

rearrange

=-6r+6

Hence option A is correct

what is the volume of a sphere if the diameter is 21 cm using formula v=4/3 pie (r3). use 3.14 for pie

Answers

Answer:

4846.59

Step-by-step explanation:

21/2= 10.5 as your radius

10.5^3(3.14)(4/3) = 4846.59

What is the median of the distribution?

Answers

Answer:

In order to calculate the median, the data must first be ranked (sorted in ascending order). The median is the number in the middle. Median = the middle value of a set of ordered data.

Step-by-step explanation:

A rectangle doormat is 21 inches long and has an area of 714 squar inches. Find its width. Will the doormat fit in an

Answers

Answer:

34in

Step-by-step explanation:

Given data

Length= 21in

Area= 714 in^2

The shape of the doormat is rectangular

Area= Length*Width

substitute

714=21* W

W= 714/21

W= 34in

Hence the widht is 34in

If a cheetah runs 120 miles in 3 hours haw many miles does it travel in one hour

Answers

It runs 40 mph bc 120 divided by 3= 40

what is the slant height of a pyramid with surface area of 209 square centimeters and a square base with sides of 7 centimeters? round to the nearest tenth.​

Answers

Answer:

Step-by-step explanation:

base b = 7

slant height = L

area of base = 49 cm²

lateral area = surface area - base area = 209 - 49 = 160 cm²

area of one lateral face = 160/4 = 40 cm²

½·b·L = 40

L = 80/7 ≅ 11.4 cm

Name the transformation that maps A PQR to A P'Q'R'
У
6
P
R
6
o
R
P
--6
Reflection over the x axis
Reflection over the yaxis
180° Rotation
Translation down 4 units

Answers

Answer:

Option (1)

Step-by-step explanation:

Coordinates of the vertices of ΔPQR,

P → (2, 5)

Q → (6, 2)

R → (2, 2)

Now vertices of the transformed triangle,

P' → (2, -5)

Q' → (6, -2)

R' → (2, -2)

If we compare P and P' relation between their coordinates is,

P(2, 5) → P'(2, -5)

(x, y) → (x, -y)

Which reveals that triangle PQR has been reflected across x-axis to form the image triangle P'Q'R'.

Option (1) is the answer.

A number, n, is divided by 4 and then subtracted from 5, resulting in 13. What is the value of n?

Answers

are you sure this question is right? there are no negatives? i’m pretty sure the answer is 72 but if i’m wrong, i’m sorry.

Answer:

-6.8

Step-by-step explanation:

test-nav

what is Qanon a lot of people at school keep talking about it but i dont know what it is

Answers

it’s a wide-ranging, completely unfounded theory that says that president trump is waging a secret war against elite satan-worshipping in paeophiles in government, business and the media.

Can someone plz help me with this one problem plzzz!!!

Answers

so, you just use the x's from the table and plug them into the equation to find the y.

y=(1)+9

y=10

y=(2)+9

y=11

y=(3)+9

y=12

y=(4)+9

y=13

i hope this helps :)

Help please I’ll mark brainliest

Answers

Answer:

- [tex]\frac{1}{2}[/tex]

Step-by-step explanation:

One cubic down and 2 cubics to the right

Evaluate -4(12) please help

Answers

Answer:

You are going to get -48

Step-by-step explanation:

For some of the reason, this seemed like multiplication

But anyway, hope this helps, The other person Put down an answer that maybe is incorrect and they posted it like a file like they just don't care like a BOT

please answer this I will give u​

Answers

Answer:

Step-by-step explanation:

The 3 angles must add up to 180. So

6x + 4x + 2x = 180

12x = 180

x = 15

Plug this into all the angles and you have your answers

Answer:

Step-by-step explanation:

The sum of a triangles angles is always 180 degrees.

2x+4x+6x=180

12x=180

x=15

A=6x=6(15)=90 degrees

B=2x=2(15)=30 degrees

C=4x=4(15)=60 degrees

who lives in florida.

Answers

Answer:

I live in new Mexico:))))

Answer:

Not me, lol

Step-by-step explanation:

I live in Kentucky, but I got a friend that lives in Florida.

Can I have brainliest? I'm tryna level up.

Stay safe and have a wonderful day/night!!!!! :)

Match each diagram with a description and an equation.

Answers

Graphs such as line and tape diagrams can be used to represent equations.

The equation of the first diagram is y = 0.6x,and it represents a decrease by 0.4 or 2/5The equation of the second diagram is y = 1.83x,and it represents an increase of 5/11 or 0.83

Diagram (a)

In this diagram, all the x boxes (5 boxes) are shaded, while all the y boxes (3) are shaded.

So, the equation is:

[tex]y = \frac{3}{5}x[/tex]

Express as decimal

[tex]y = 0.6x[/tex]

The ratio (0.6) is less than 1.

So, it represents a decrement.

And the decrement (d) is:

[tex]d = 1 - 0.6[/tex]

[tex]d =0.4[/tex]

Diagram (b)

In this diagram, all the x boxes (6 boxes) are shaded, while part of  the y boxes (6 of the 11) are shaded.

So, the equation is:

[tex]y = \frac{11}{6}x[/tex]

Express as decimal

[tex]y = 1.83x[/tex]

The ratio (1.83) is greater than 1.

So, it represents an increment.

And the increment (d) is:

[tex]d = 1.83 - 1[/tex]

[tex]d = 0.83[/tex]

See attachment for the diagrams at:

Read more about diagrams and equations at:

https://brainly.com/question/14323743

Answer:576

Step-by-step explanation:

What is m2 2 + m_3? I need the answer please help

Answers

Answer:

90

Step-by-step explanation:

because m3+m4 = 90 and m2 and m4 are corresponding angles. therefore m4 = m2 so m3 +m2 = 90

17. Macro mineral needed to build strong bones and teeth
A- iron
B -calcium
18. Bodies inability to break down lactose due to absence of the enzyme lactase
A- Lactose Intolerant
B- Celiac Disease

Please HELP ME ITS DUE LIKE RN

Answers

Answer:

b

Step-by-step explanation:

b because its just the only stand out answer

the local frozen yogurt store has two different containers for customers to use micheal chooses the container below the second container is a rectangular prism and holds three times as much yogurt as the container micheal chose

Answers

Answer:

The answer is "C"

Step-by-step explanation:

4 x 4 x 4.7 = 75.2

which is closes to:

72

Which is:

three times as much yogurt as the container Michael chose

Because the original number is:

24

Your welcome.

25
14
Which situation is represented by the equation?
2x +6= 12
solve this
ion?
A) 6 more than the product of 2 times x is 12
B) 6 less than the product of 2 times x is 12
C) the product of 6 and a number is 2 more than 12
D) the difference of a number and 6 is 12 times x

Answers

Answer:

A

Step-by-step explanation:

7) Steve buys a new laptop for $729.00. If the sales
tax rate is 9.25%, what is the total cost of the
laptop?
A) $796.43
B) $785.54
C) $774,65
D) $763.76
E) $752.87
Help please ASAP

Answers

it would be A. 796.43

Trojúhelník se stranami dlouhými 8 cm, 10 cm a 12 cm potřebujeme zmenšit tak, aby nejdelší strana byla dlouhá 9cm. V jakém poměru se budou strany měnit? Jaké budou rozměry ostatních stran?

Answers

Answer:

i do not know

Step-by-step explanation:

plreae help me

Option A
Option B
Option C
Option D​

Answers

option d, because 6 can be divided by 2 and that’s 3, and 10 can be divided by 2 and that’s 5 !!

[tex]\huge\text{Hey there!}[/tex]

[tex]\textsf{A ratio equivalent to 6:10 is:}[/tex]

[tex]\textsf{A) 3:4}[/tex]

[tex]\textsf{B) 18:30}[/tex]

[tex]\textsf{C) 12:40}[/tex]

[tex]\textsf{D) 5:3}[/tex]

[tex]\textsf{You can find equivalent ratios if you DIVIDE both numbers by their GCF}\\\textsf{(Greatest Common Factor)}[/tex]

[tex]\mathsf{6: 1,2,3,6}\\\\\mathsf{10: 1,2,5,10}\\\\\\\textsf{DIVIDE both numbers (6 \& 10) from 2 since it is its GCF}\\\\\mathsf{6\div2 = 3}\\\mathsf{10\div2= 5}\\\\\textsf{ \bf \huge = 5:3}[/tex]

[tex]\boxed{\boxed{\huge\textsf{Answer: \bf D. 5:3}}}\huge\checkmark[/tex]

[tex]\text{Good luck on your assignment and enjoy your day!}[/tex]

~[tex]\frak{Amphitrite1040:)}[/tex]

Solve x−8>−4.

20 points and maybe a brainliest

Answers

Answer:

X = 12

Step-by-step explanation:

Just add 8 to both sides to set the equation balanced. I hope this helps :)

30 POINTS PLEASE HELP ASAP!!!
An incomplete proof of 1- tanθcosθ/cscθ=cos^2 θ is shown.
Which of the following expressions could be used to complete the second step of the proof?

Answers

It's the fourth option, 1 - sinθ/cscθ. This is due to the cancellation of cosθ in the numerator:

1 - (sinθ/cosθ × cosθ)/cscθ = 1 - sinθ/cscθ

A curious patterns occurs in a group of people who all shake hands with one another. It turns out that you can predict the number of handshakes that will occur if you know the number of people. If we are in a room of 5 people, we can determine the number of handshakes by this line of reasoning: The first person will shake 4 hands (she won’t shake her own). The second person will shake 3 hands (he won’t shake his own of the hand of the first person, they already shook). The third person will shake 2 hands (same reasoning). The fourth person will shake 1 hand (that of the fifth person). The fifth person will shake 0 hands. So there will be a total of 1+2+3+4=10 handshakes

Answers

Missing part of the question

Determine the number of handshakes, i, that will occur for each number of people, n, in a particular room. (people)

Answer:

[tex]S_n = \frac{n}{2}(n - 1)[/tex]

Step-by-step explanation:

Given

For 5 people

[tex]\begin{array}{cc}{People} & {Handshakes} & {5} & {4} & {4} & {3} & {3} & {2} & {2} & {1} & {1} & {0} &{Total} & {10} \ \end{array}[/tex]

Using the given instance of 5 people, the number of handshakes can be represented as:

[tex](n - 1) + (n - 2) + (n - 3) + ........ + 3 + 2 + 1 + 0[/tex]

The above sequence is an arithmetic sequence and the total number of handshakes is the sum of n terms of the sequence.

[tex]S_n = \frac{n}{2}{(T_1 + T_n})[/tex]

Where

[tex]T_1 = n - 1[/tex] --- The first term

[tex]T_n = 0[/tex] --- The last term

So:

[tex]S_n = \frac{n}{2}(n - 1 + 0)[/tex]

[tex]S_n = \frac{n}{2}(n - 1)[/tex]

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