Mathematics
Mathematics, 05.02.2021 21:50, therealrg10

A researcher wants to conduct a study to see if cell phones cause headaches. The researcher finds 30 individuals who use cell phones regularly and 30 that do not. Each of the 60 individuals are given a questionnaire designed to determine headache frequency. If the 60 individuals did not know they were participating in the study, which statement about the study is correct? a. It is an experiment where cell phone habits is a blocking variable.
b. It is an observational study.
c. It is a matched-pairs design.
d. It is a randomized experiment.
e. It is a double-blind study.

answer
Answers: 3

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 19:20, axelsanchez7710
The suare root of 9x plus 7 plus the square rot of 2x equall to 7
Answers: 1
image
Mathematics, 21.06.2019 23:00, hd14yarnell
Is there a direction u in which the rate of change of f(x, y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.
Answers: 2
image
Mathematics, 22.06.2019 00:30, Delgadojacky0206
The water company charges a residential customer $41 for the first 3,000 gallons of water used and $1 for every 200 gallons used over 3000 gallons. if the water bill was $58 how many gallons of water were usedanswersa 3400 gallonsb 6000 gallonsc 6400 gallons d 7000 gallons
Answers: 2
image
Mathematics, 22.06.2019 02:30, aboatright7410
Witch sequence shows a pattern where each term is 1.5 times the previous term
Answers: 3
Do you know the correct answer?
A researcher wants to conduct a study to see if cell phones cause headaches. The researcher finds 30...

Questions in other subjects: