Author Question: Research indicates the people who suffer from depression also tend to experience insomnia. However, ... (Read 31 times)

dbose · **on:** Jun 19, 2018

Research indicates the people who suffer from depression also tend to experience insomnia. However, it is unclear whether the depression causes insomnia or the lack of sleep causes depression. This is an example of the ____.

a. directionality problem
b. third-variable problem
c. extraneous variable problem
d. manipulation check problem

Question 2

In ____ sampling, the major subgroups of the population are represented in equal amounts.

a. proportional quota
b. snowball
c. heterogeneity
d. expert