Question

When each subject participates in all the levels of the independent variable it is called a

        _______ design, but if there are different subjects in each level of the independent variable,

        it is called a _______ design.

Select one:

a. within-subjects; mixed

b. between-subjects; factorial

c. mixed; independent-group

d. within-subjects; between-subjects

Answer 1

When each subject participates in all the levels of the independent variable it is called a within-subjects design, but if there are different subjects in each level of the independent variable, it is called a between-subjects design.

Note: i) Within-subjects (or repeated-measures) study design: the same person tests all the conditions (i.e., all the user interfaces)

ii) Between-subjects (or between-groups) study design: different people test each condition, so that each person is only exposed to a single user interface.