11. An experimental research design in which measurements are taken at equal intervals before and after a program is called a(n)

A. time series test

B. case-control study

C. cross-sectional survey

D. in-depth interview

12. The primary weakness of field experiments is the difficulty of observing the sequence of influence between variables.

True or False?

13. A sampling frame is the population from which a sample is selected.

True or False?

14. A cohort is a group of individuals who experience the same significant event within a specified period or who share some major characteristic.

True or False?

15. An independent variable is examined to determine whether its observed value changes when it is exposed to an intervention.

True or False?