Question

Researchers in mental health fields are often interested in evaluating the effectiveness of using food images to enhance positive mood. Adapting a typical design from such studies, suppose we have participants rate their mood change on a standard self-report affect scale after viewing images of "comfort" foods, fruits/vegetables (F/V), and random non-food images (used as a control group). The results are given in the table at right for this hypothetical study.

(a) Complete the F-table. (Round your answers to two decimal places.)

Images

Control FV   Comfort foods

0            0           3

0            1            2

1             2            4

3             2            5

0              1           0

Source of Variation SS df MS F

Between groups

Within groups (error)

                          total

Answer 1

a) The complete F table is :

Source	DF	Sum of Squares	Mean sum of squares	F	p-value
Between Groups	2	11.2	5.6	2.75	0.104
Within Groups (Error)	12	24.4	2.033
Total	14	35.6