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What kind of evidence is this?

6
In 2007, Belgian researchers surveyed 1,656 teenagers about their use of mobile
phones after lights-out, and found those who used a phone less than once per
week were more than twice as likely to be 'very tired" a year later as those who never
did. (from "The End of Night" by Rebecca Boyle)
Hypothetical
12
Analogy
Study
15
Expert opinion

1 Answer

4 votes
C. Study because it was being researched
User Jverdi
by
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