Researchers in mental health fields are often interested inevaluating the effectiveness of using food images to enhancepositive mood. Adapting a typical design from such studies, supposewe have participants rate their mood change on a standardself-report affect scale after viewing images of "comfort" foods,fruits/vegetables (F/V), and random non-food images (used as acontrol group). The results are given in the table at right forthis hypothetical study.
| Images |
|---|
| Control | F/V | Comfort
Foods |
|---|
| 0 | 0 | 3 |
| 1 | 1 | 2 |
| 1 | 2 | 3 |
| 3 | 3 | 5 |
| 0 | 1 | 0 |
(a) Complete the F-table. (Round your answers to twodecimal places.)
Source of
Variation | SS | df | MS | Fobt |
|---|
Between
groups | | | | |
Between
persons | | | | |
Within
groups (error) | | | | |
| Total | | | | |
(b) Compute a Bonferroni procedure and interpret the results.(Assume experimentwise alpha equal to 0.05. Select all thatapply.)
There were no significant differences between any of thegroups.Participants rated a significantly larger mood change afterviewing images of fruits/vegetables compared with the mood changeafter viewing control images.Participants rated a significantlylarger mood change after viewing images of comfort foods comparedwith the mood change after viewing images offruits/vegetables.Participants rated a significantly larger moodchange after viewing images of comfort foods compared with the moodchange after viewing control images.
