Political scientists investigated whether objectification/dehumanization of women had an effect on the likelihood of electoral support for women political candidates. Half of participants were assigned to view a series of objectifying images, and half were assigned to view neural images. Then participants were given a survey to ask various attitudes about women candidates. This is an example of a

1. matched pair design

2. block design

3. cross-over design

4. completely randomized design

5. identical replicate design