Which of the following is a common difficulty in cross-sectional research?

There are too many variables to keep track of.
Longitudinal changes are not easily measured.
Cohort differences—that is, differences in background variables.
Cultural differences.

Cohort differences—that is, differences in background variables.

Psychology

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When a child begins to leave his mother voluntarily, he is expressing a desire for ______

a. attention c. autonomy b. privacy d. discipline

Psychology

If a one-way ?2 yielded a value of 4.99,

a. what we observed was significantly different from what we expected. b. what we observed was not significantly different from what we expected. c. the two variables are related. d. We do not have enough information to decide.

Psychology