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
USPshnik [31]
3 years ago
11

The data were gathered by the following procedure, reported in the study. "Between January and June 1998, parents of children ag

ed 2-16 years [...] that were seen as outpatients in a university pediatric ophthalmology clinic completed a questionnaire on the child’s light exposure both at present and before the age of 2 years." Was this study observational, or was it a controlled experiment? Explain.
Mathematics
1 answer:
WARRIOR [948]3 years ago
7 0

Answer:

This was an observational study.

Step-by-step explanation:

Given is that parents of children completed a questionnaire on the child’s light exposure both at present and before the age of 2 years.

This was an observational study since there is no treatment or control group.

We know that treatment, control groups or treatment groups are not specific to randomized control experiments.

You might be interested in
Write an inequality for people younger than 8 get in for $45
Tema [17]

Answer:

8 ≤ $45

Step-by-step explanation:

Given:

People younger than 8 get in for $45.

Now we can assume that the cost given might be to enter in the garden or might be in fair or might be at museum or might be at a zoo which is $45 for people which are younger than 8.

Now we can say for people younger than 8 means people or children who are of 8 years or who are below 8 years or say less than 8 years.

Hence we can say people who are less than or equal to 8 get in for $45

So the inequality equation becomes.

8 ≤ $45

6 0
3 years ago
write an equation of the line with the following information. Through (4,1) and perpendicular to y=1/3x +3
Yakvenalex [24]
Perpendicular means the two lines' slopes are negative reciprocal to each other. the slope of the given line is 1/3, therefore the slope of the perpendicular line is -3/1, which is -3
use the point-slope form: the given point is (4,1), so (y-1)=-3(x-4)
you can stop right here or you can write it into slope intercept form:
y-1=-3x+12
y=-3x+13
5 0
3 years ago
Aziraphale bought books to be shipped to his library, in case they got out of stock. He bought 36 books, each having a total of
anzhelika [568]

Answer:

216

Step-by-step explanation:

36 times 10 = 360

360 times 0.60  = 216

3 0
3 years ago
PLESE HELP ILL GIVE BRAINLIEST!,!!!!!
Bogdan [553]

Answer:

9.8x + 1.1y + 9.9z

Step-by-step explanation:

\textsf {The perimeter is the sum of the side lengths.}

\textsf {Hence, the perimeter is :}

⇒ 5.5x + 6.2y + 4.3x + 8.3z + 1.6z - 5.1y

⇒ 9.8x + 1.1y + 9.9z

5 0
2 years ago
Read 2 more answers
How to write 6 5/8 mixed number as a fraction
mars1129 [50]
Improper fraction = 53/8
decimal = 6.625
percent = 662.5%
7 0
3 years ago
Read 2 more answers
Other questions:
  • for a function, can the number of elements in the range be greater than the number of elements in the domain? explain.
    7·2 answers
  • Last year a large trucking company delivered 8.0 x 105 tons of goods with an average value of $30,000 per ton. What was the tota
    9·2 answers
  • Hey folks! I need some help with this exercise
    9·2 answers
  • How can I reduce 60/1000 into simplest form?
    6·2 answers
  • Triangle △ABC is in the first quadrant and translated along ‹ 3, 7 › and reflected across the x-axis. Which quadrant will the tr
    8·1 answer
  • Which one of these shapes is not like the others?<br><br> Shape A<br> Shape B<br> Shape C
    6·2 answers
  • Tan C= <br> Help help help
    9·2 answers
  • At a student council meeting, there was a total of 65 students present. Of those students, 35 were female.
    6·1 answer
  • Eve bought a bag of 26 sour candies. She ate s of the candies. Write an expression that shows how many sour candies Eve has now?
    9·1 answer
  • What is the radius and diameter of the following circle?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!