1. Researchers recruited over 1,000 patients with chronic back pain to participate in a study about the benefits of acupuncture. Each subject was randomly assigned to one of these treatment
plans: traditional Chinese acupuncture, placebo acupuncture, and conventional pain treatment of
medication and physical therapy.
What is the primary purpose of randomly assigning subjects to the different treatment plans?
(2 Points)
To increase confounding variables
To create groups that are as similar as possible so the main difference between the groups is the
treatments
To control against nonresponse
To ensure both the subjects and researchers are blind to who is in which group
To reduce the impact of sampling variability

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

in geometry, parallel lines are lines in a plane which do not meet; that is, two lines in a plane that do not intersect or touch each other at any point are said to be parallel. by extension, a line and a plane, or two planes, in three-dimensional euclidean space that do not share a point are said to be parallel.

idk

step-by-step explanation:

answer: i ! the answer is   9000 seconds, also d

hope i

-lavira : )