Mathematics, 07.01.2020 19:31 jessicaflower277
Ascientist is studying the effects of cell phone use on headache rate. she identifies 30 people who use cell phones and 30 who do not. each of the 60 people is given a questionnaire designed to determine headache frequency. none of the 60 people who participated in the study knew they were part of a study. which statement is true? (5 points) question 5 options: 1) this is a randomized comparative experiment. 2) this is an observational study. 3) this is a double-blind study. 4) this is a matched-pairs design.
Answers: 1
Mathematics, 21.06.2019 23:00
Solve the problem by making up an equation. a man could arrive on time for an appointment if he drove the car at 40 mph; however, since he left the house 15 minutes late, he drove the car at 50 mph and arrive 3 minutes early for the appointment. how far from his house was his appointment?
Answers: 1
Mathematics, 21.06.2019 23:30
Which function represents the sequence? f(n)=n+3 f(n)=7nβ4 f(n)=3n+7 f(n)=n+7
Answers: 1
Mathematics, 22.06.2019 01:30
Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample
Answers: 3
Ascientist is studying the effects of cell phone use on headache rate. she identifies 30 people who...
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