To study the effect of the type of stimulus on memory recall, zhong subjects participants to either an auditory or visual presentation of a poem. after the presentation, the participants are asked to answer several questions about the poem. which type of experimental design has zhong employed?

Posttest only

Explanation:

The posttest-only control gathering configuration is an examination plan in which there are in any event two gatherings, one of which doesn't get a treatment or intercession, and information are gathered on the result measure after the treatment or mediation

using the scientific method.