1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
love history [14]
3 years ago
12

A study is conducted to determine if the blue light from a tablet device will affect the fall asleep time of people in various a

ge groups differently. Volunteers for the study are grouped by age: 18-30, 31-50, and 50. Half of each group is assigned a standard tablet, the other half is assigned a tablet with reduced blue light. People in each group are asked to use the tablet for 10 minutes before bed and their fall asleep time is recorded. Which of the following is correct?
a. Blocks: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: How the eyes react to blue light.
b. Blocks: the three age groups. Treatments: measuring how long it takes to fall asleep. Response variable: The hours of sleep recorded.
c. Strata: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: How the eyes react to blue light.
d. Blocks: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: Time it takes to fall asleep.
e. Blocks: the group receiving the standard tablet and the group receiving the reduced blue light tablet. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: Time it takes to fall asleep.
Mathematics
1 answer:
stepan [7]3 years ago
6 0

Answer: (d) Blocks: the three age groups. Treatments: using the standard tablet or the reduced blue light tablet before bed. Response variable: time it takes to fall asleep

Step-by-step explanation:

You might be interested in
A clock tower has a circular clock face with an area of 144pi square feet. What is the diameter of the clock face? Teacher wants
nekit [7.7K]

Answer:

d = 24

Step-by-step explanation:

The area of a circle is given by A = π * r²

We are told the area of the clock is 144π.

Let's clear the formula for the radius:

r² = A / π

r² = 144π / π

r² = 144

r = √144

r = 12

The diameter is two times the radius, d = 2r = 2*12 = 24.

5 0
2 years ago
Avery has a total of $12.50 in her piggy bank at home. Each week she takes out $1.25 to ride the city bus. Write an equation rep
NISA [10]
The the number of weeks would be 10 weeks
6 0
3 years ago
Read 2 more answers
How many distinct triangles can be formed for which m∠A = 75°, a = 2, and b = 3?
antiseptic1488 [7]
We can use the Sine Law:a / sin A = b / sin B2 / sin 75° = 3 / sin B2 / 0.966 = 3 / sin B  ( after that we will cross multiply )
2 sin B = 3 · 0.9662 sin B = 2.898sin B = 2.898 : 2sin B = 1.499 > 1  ( it is not possible )Answer:  A ) No triangles can be formed.


8 0
3 years ago
(a) Complete the table of values for y- 2x + 5<br> -<br> 0<br> 1<br> 2<br> 1<br> 5<br> Y
maxonik [38]

Answer:

Step-by-step explanation:

I think you meant y = -2x + 5.

x    y = -2x + 5

0                       5

1      -2(1) + 5 =   3

2     -2(2) + 5 =   1

Note that every time you increase x by 1, y decreases by 2.

5 0
2 years ago
5. Write an expression equivalent to x - 3y + 4.​
Pepsi [2]

Answer:

2x - 6y + 8

Step-by-step explanation:

7 0
2 years ago
Other questions:
  • Evaluate \frac{7a+b}{b+c} if a=2,b=6,c=4
    8·2 answers
  • Someone answer this for me please ..​
    13·1 answer
  • Please check if u can help
    10·2 answers
  • What is the missing length?
    9·1 answer
  • Angle A corresponds to Angle<br> OB<br> Oc<br> ОЕ<br> OD<br> none of the above
    9·1 answer
  • I need help on this lol
    5·2 answers
  • A boat traveled 308 miles each way downstream and back. The trip downstream took 11 hours. The trip back took 22 hours. Find the
    5·1 answer
  • Determine two numbers whose sum is 9 and whose product is 20, by<br> solving a quadratic equation.
    7·2 answers
  • Determine the domain of (g ∘ f)(x) if f (x) = x2 + x − 3 and g of x is equal to 1 over the quantity x plus 1 end quantity period
    14·1 answer
  • How do you solve these two questions and what are the answers?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!