Ryan wanted to study the effect of adult play with preschoolers on the children's noisiness. so, he went to one preschool for a week and played with the children during breaks. at the end of the week, he measured their noisiness. for comparison purposes, he found another preschool across town and measured their noisiness as well to see the effect of playing with the children. which design does this example refle?

Static-group comparison design

Explanation:

Based on the information provided within the question in regards to the situation at hand it can be said that the design that was used was a Static-group comparison design. This research design focuses on studying two separate groups, one of which is given the treatment while the other is not. The results are then compared with one another to come to a conclusion. This is what Ryan did, which in this scenario the group that received the "treatment" was the group that got to play with Ryan, since that is what he is trying to study.

answer; john b watson,(observable behavior);