A researcher is interested in the disruptive effects of texting on simulated driving. Using a self-report, the researcher identifies how often participants text in their everyday lives. Then, she takes the two participants who text the most and randomly assigns one to the texting group and the other to a control group. Using this strategy she assigns all participants to groups, including the two participants who text the least in everyday life. The researcher is using to create groups.

matched-pair assignment

Explanation:

This study has two treatments. This researcher is using a matched pair from what we can see in the question. Matched pairs are used in the case of two treatment groups. The participants or subjects are grouped in twos. Among the two, she assigns different treatment to them. We can see that this researcher picks two people (pairs) from those that texts the most to those that texts the least. From each pair, one is a control treatment and the other is in the texting group.

answer; decreased;

answer; the natural law school;