A group of scientists is conducting an experiment on the effects of media on children. They randomly select 100 children and randomly assign
each child to one of four treatment groups. Each treatment group has a specific amount of screen time during a one-week time frame. The
first group has no screen time, the second group has two hours of screen time, the third group has four hours of screen time, and the fourth
group has six hours of screen time,
After the first week, the scientists conduct the same experiment, with the same subject groups, for three more weeks so that each group
experiences each of the four treatments.
Which statements about this study are true?
This study uses blinding.
This study uses random sampling
This study uses a control group.
ооо
This study uses blocking.
This study uses a repeated measures design.

Answers

Answer 1

The statements that are true about this study are:

This study uses random sampling. This study uses a control group. This study uses a repeated measures design.

Random sampling occurs when each sample has an equal probability of being chosen in a study.

This is seen in the random selection of 100 children. The Control group was used with the first group that had no screen time.

The repeated measures design was also used when multiple measurements were taken during different weeks.

Learn more about experiments here:

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Related Questions

Solve. x 2 = 7
pls help!!

Answers

Answer:

x = 14

Step-by-step explanation:

1) Multiply both sides by 2.

x = 7 * 2

2) Simplify 7 * 2 to 14.

x = 14

Answer:

Step-by-step explanation:

when using diversions in fractions to whole numbers you will always multiply the denominator by the whole number. So 2 x 7 equals 14. :))

square pyramid has _______ spaces

Answers

Answer:

A square pyramid has five faces: four triangle faces and one square face.

Step-by-step explanation:

Squareee pyramidd has 5 faces

Aaron ran 2 1/4 miles in 20 minutes. Based on this , how fast is he running one mile ?

Answers

Answer: Aaron is running 8 minutes and 53 seconds per mile.

Help me, please? I dont understand these

Answers

Do you not know what slope is? Just use the slope formula which is y2-y1/x2-x1
Choose 2 coordinates and pick one of the y values to subtract by the other and the same x value correlated with ur first y value u subtracted minus the other x value

8. There are 18 trumpets in a music room. These trumpets will be placed in 3 equal rows. Which number sentence can be used to find the number of trumpets in each row?

Answers

Answer:

18÷3=6

Step-by-step explanation:

18 trumpets have to be DIVIDED into 3 rows so you would divide 18 by three to get 6 trumpets in each row.

convert 24580 m into km with process

Answers

Answer:

24.58 km

Step-by-step explanation:

1 km = 1000 m

1 m = 1 / 1000 km

24580 m

= 24580 / 1000

= 24.58 km

The absolute value of | – 71 – 19 – 18% is -16.
TRUE
FALSE

Answers

Answer: False i think

Step-by-step explanation:

Pardon me I don't mean to pry I saw the tears falling from your eyes and I thought you're too pretty to not wear a smile hope you don't mind if I sit down for while
NAME THE SONG AND THE SINGER 50 POINTS!!!!!!!!!!

Answers

Answer: Jon Pardi - Tequila Little Time

Step-by-step explanation:

I don't even know what this song is, but I searched it up.

Need help a lot stuck

Answers

The answer is A

ok done. Thank to me :>

consider equation of circle x2-2x+y2-4y-4=0,if line 2x-y+a=0 is its diameter then find value of a

Answers

Answer:

Step-by-step explanation:

x² - 2x + y² - 4y - 4 = 0

x² - 2x + y² - 4y = 4

complete the squares

(x² - 2x + x₀) + (y² - 4y + y₀) = 4

the unknown number will be the square of half of the x¹ coefficient

(x² - 2x + 1) + (y² - 4y + 4) = 4 + 1 + 4

(x - 1)² + (y - 2)² = 9

This tells us that the circle is centered on (1, 2)

Which is also a point on the diameter

2x - y + a = 0

a = y - 2x

a = 2 - 2(1)

a = 0

- Draw A' the symmetric of A with respect to point O

- Draw A' the symmetric of A with respect to (d)

Answers

Answer:

how am i supposed to answer this? draw a line lol

Step-by-step explanation:

Please help!!!!
check for understanding:

Answers

Answer:i thinks is 115.9 maybe im not sure because its in my HW

Step-by-step explanation:

Answer:

x=7.245

Step-by-step explanation:

pythagoras theorem says:

c=√a^2+b^2

so:

c=a2+b2=3.22+6.52≈7.245

HELPPPPOPPPOPPÑPPÑÑÑ

Answers

So for 1 hour you pay 10 dolars then for 3 you pay 30 then for 11 you pay 110 then for 20 you pay 200.

For B and C I dont Know sorry.

How long it would it take to spread a rumor in a town of 90,000 people if each person who heard the rumor told it to 3 new people every 15 minutes?

Answers

Answer:

it would take 30k minutes, equivalent to 500 hours/almost 21 days/almost 3 weeks

Step-by-step explanation:

Which of the following rules represents the function shown in the table?
f(x)=n+3
f(x)=3n
f(x)=1/3n

Answers

Answer:

f(x)=3n

Step-by-step explanation:

We can see it goes x=2 to y=6 this has been times by 3, x=-1 to y=-3 also times by 3 and x=0 y=0 0x3=0

7x+27x+2 from -5x^2-2x
ADDING AND SUBTRACTING POLYNOMIALS

Answers

Answer:

7x+27x=34x

34x+2-(-5×^2)-2x

34x+2+5x^2-2x

34x+2x=36x

36x+2+5x^2

Which of the following numbers is proportional to 84/108?
1. 86/110
2.98/126
3.64/72
4.91/104

Answers

Proportional numbers are numbers with the same equivalent ratio

98/126 is proportional to 84/108

The number is given as:

[tex]Number = \frac{84}{108}[/tex]

Reduce fraction to the lowest term

[tex]Number = \frac{7}{9}[/tex]

Reduce 86/110 to the lowest term

[tex]Number = \frac{86}{110}[/tex]

Divide by 2/2

[tex]Number = \frac{43}{55}[/tex]

43/55 is not equivalent to 7/9

Reduce 98/126 to the lowest term

[tex]Number = \frac{98}{126}[/tex]

Divide by 14/14

[tex]Number = \frac{7}{9}[/tex]

7/9 is equivalent to 7/9.

Hence, 98/126 is proportional to 84/108

Read more about proportional numbers at:

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can someone please help me i'm almost done with my work

Answers

Answer:

you are correct with the following question

The answer is D, you have the right one chosen

Describe the location from the origin of each point in problem 5

Answers

Elaborate, where’s the picture of the problem?

11/2-2/3 help me plz

Answers

4.83

answer above answer above answer above

Hope this helped, bye:)

How many solutions does this system have?

y = -6x - 5

-2y +7 = 12x

A.
One Solution

B.
Two Solutions

C.
No Solutions ***** (what i think)

D.
Infinitely Many Solutions

Answers

A system of equation may have one, zero or infinitely many solutions

The system of equation has no solutions

The systems of equation are given as:

[tex]y = -6x - 5[/tex]

[tex]-2y +7 = 12x[/tex]

Substitute -6x - 5 for y in [tex]-2y +7 = 12x[/tex]

[tex]-2(-6x - 5) +7 = 12x[/tex]

Open brackets

[tex]12x + 10 +7 = 12x[/tex]

[tex]12x + 17 = 12x[/tex]

Subtract 12x from both sides of the equation

[tex]17 = 0[/tex]

The above equation is not true i.e.[tex]17 \ne 0[/tex]

Hence, the system of equation has no solutions

Read more about solutions of equations at:

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he .......... be eating pizza.

Answers

The answer is A will...........

He will be eating pizza

S + will + be + V_ing

11,16,21,...
Find the 43rd term.
Find the 43rd term.

Answers

Answer:

You add 5 each time so we just need to multiple 5 by 40 since we alredy have the first three terms.

40*5=200

21+200=221

Hope This Helps!!!

Which expression has a value of −8?

Answers

Answer:

-4+-3+2-3

Step-by-step explanation:

7. at + b = ar – c
Solve for a

Answers

okkkkkkkkkkkkkkkkkkkkkkkkkkk

write an inequality with a solution that matches the graph at least two steps should be needed to solve your inequality. Just 62 and 64 please

Answers

Answer:

x >= -2

-2 < x < 1

as an estimation we are told 5 miles is 8km convert 60km to miles

Answers

Answer:

60km is 37 Miles

it is a decimal- 37.2 Miles

Step-by-step explanation:

divide 60 by 1.609

Answer: using this we can say that 60km is 37.5 miles

Step-by-step explanation:

first you divide 60 and 8 which gives us 7.5

using this we multiply 7.5*5=37.5

HELP!!!! If you help me with this you’ll be my favorite person ever

Answers

Y= -1/4x+6 thereee youuu go !!

12 - 33/4 equal in fraction form?

Answers

The answer is 3 3/4
Happy Holidays!

Answer:

The answer is 3 3/4 I think

Step-by-step explanation:

Compute the area of a circle with a diameter of 18 inches.

Answers

Answer:

254.34

Step-by-step explanation:

Diameter: 2×radius

Radius:Diameter÷2

Area: pi×radius²

18/2=9

Radius=9

pi=3.14

3.14×9²=254.34

The area is 254.34

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