To study the effect of different types of stimulus on memory recall, Zhong subjects participants divided into two equivalent groups to either an auditory or a 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 above example is an example of a posttest only design. In a posttest only design, all individuals in groups receive treatment and intervention and there is a neutral comparison among them. Example we observe how all the participants above are divided into equivalent groups. This is different from posttest control group design. In a posttest only control group design, there at least two groups and one group receives a treatment or intervention while the other does not receive any. The group that receives treatment is called the control group while the other is called the experimental group. In this research design, the groups are compared and data is collected in measuring the effectiveness of the treatment as it compares to the groups

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.