To study the effect of stimulus type on memory recall, Hayden had participants receive either an auditory or visual presentation of a poem. After the presentation, participants were asked to answer several questions about the poem. Which experimental design did Hayden use?

Hayden used posttest-only research design.

Explanation:

The posttest-only control group design is a method used in research design where a test is given to the students after an instructional program is completed. It is normally used in conjunction with a pretest which helps identifying the effectiveness of the program

the answer is b: a lockout

answer; construals;