subject
Mathematics, 29.10.2020 01:00 yooooo005

1) Near-sightedness typically develops during the childhood years. Recent studies have investigated a possible association between near-sightedness and
the use of night- lights with infants. In a study by Quinn, Shin, Maguire, and Stone
(1999), researchers surveyed parents of 479 children visiting a pediatric
ophthalmology clinic. One of the questions was "Under which lighting condition
did/does your child sleep at night?" before the age of 2 years. The parents chose
between "room lighting," "a night light," and "darkness." Based on the child's
most recent eye examination, researchers separated the children into three
groups: near-sighted, normal refraction, or far-sighted.
a) Who are the individuals of interest in thisstudy?
b) What is the explanatory variable in this study? Is it quantitative or
categorical?
c) What is the response variable in this study? Is it quantitative or categorical?
d) Is this an observational study or an experiment? How can you tell?
149

ansver
Answers: 2

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 13:20, payshencec21
The ratio of two numbers is 5 to 4. the sum of the numbers is 99. what number is the greater of the two numbers?
Answers: 1
image
Mathematics, 21.06.2019 18:30, trinidydavis
Which expression is not a polynomial?
Answers: 2
image
Mathematics, 21.06.2019 19:30, sotoamerica0814
What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4
Answers: 1
image
Mathematics, 21.06.2019 20:00, AleOfficial101
Hell . what are the solutions to `10x^2 - 38x - 8 = 0`? is this when i find the factors and use the numbers within the factors to determine the zeros? i hope that made sense lol
Answers: 2
You know the right answer?
1) Near-sightedness typically develops during the childhood years. Recent studies have investigated...

Questions in other subjects: