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Fifty chronic insomniacs participated in a one-month study conducted at an institute for sleep disorders. ████ ████ █████ █ ████ ██ █ ███ ████ ███ ███ █████ ████ ████ █████ █ ███████ █████ █████ ██████ █████ ██ ███ ██ ███ ██████████ █████████████ ██ ███████ ██ ███ ████████████ ██ ████ █████ ████████ ███████████ ██████ ████ ████████ ██████ ███ █████ ███ █████ ██ ███ ██████ ███ ██ ████ ██████ █████████████ ██ ███████ ██ █████ ███ ███ ████████ ██████ ███████ ████ █████ ████████ ███ ████████ ██████ ███ █████ ████ ██ ███ ██████
"Surprising" Phenomenon
Why did approximately 80 percent of people in each of the study’s groups report relief from insomnia during the first two weeks of the study and 90 percent of those from each group who reported relief from insomnia claim their insomnia returned during the third week?
Objective
The right answer will be a hypothesis that explains a key similarity between the 80 percent of people from both the placebo and treatment groups that reported relief from insomnia, the 90 percent of those from each group that reported relief but claimed their insomnia returned, or both.
19.
Which one of the following, ██ █████ ████ █████ ██ ███████ ███ ███ ████ ████ ███ ██████
a
Because it is ████ ██ █████ ██ █ █████████ ██ ███ ███ █████ ████ ██████ ████ ██ ██████ ██████████ ███ ███████ █████ ██████ ██ █████ █████ ███ ███ ██████
b
The psychological comfort ████████ ██ ███ ██████ ████ ███ ███ █████ █ ███████████████ ████ ██ ██████ ██ ███████ ████ ████████ ██ █████████
c
The new drug ██ ████ ███████ ██ ████████ ███████████ ██ ███████ █████ █████ █████ ██ █████ ████ ██████ ███ ██ ██ ████ █████████ ████ █████████
d
Most insomniacs sleep ██████ ██ █ ███ ████████████ ███ ███ ███ ████ ███ ██ ██████ ██ ██ ███████████ ███████ ██ ██████
e
Some insomniacs cannot ████████ █████████ ███ ████ █████ ████ ████ ███ ██ ███ ████ ████ ████ ██████